To check offside in football, compare an attacker’s position with the ball and the second-last opponent when a teammate plays or touches it. The attacker is only penalized if they are then involved in active play.
That timing is the part many people miss. This guide breaks down the rule, shows you how to judge a play step by step, and explains rebounds, deliberate defensive plays, and restarts. You’ll also learn why the goalkeeper is not automatically the last defender and what an assistant referee is looking for.
how to check offside in football
Use three checks: where the attacker is, when the ball is played, and whether the attacker becomes involved. All three matter. Being beyond the defenders alone does not make a player guilty of an offside offense.
Under the Laws of the Game, a player is in an offside position if, at the moment a teammate plays or touches the ball, some part of the player’s head, body, or feet is in the opponents’ half and nearer to the opponents’ goal line than both the ball and the second-last opponent. The halfway line counts as the opponents’ half for this test. A player level with the second-last opponent or level with the ball is not in an offside position.
Even then, the position is not an offense by itself. The player must become involved in active play, interfere with an opponent, or gain an advantage from that position. That second part is why a player can be beyond the defense without the referee stopping play.
The three checks to make during a play
- Find the moment of the teammate’s touch. Judge the attacker’s position when the ball is played or touched by a teammate, not when the attacker receives it. For a pass, this is usually the instant the passer makes contact with the ball.
- Compare the attacker with the ball and the second-last opponent. Check the attacker’s eligible body parts against both reference points. If the attacker is level with either the ball or the second-last opponent, they are onside.
- Decide whether the attacker becomes involved. Look for a touch of the ball, an action that challenges or obstructs an opponent, or a rebound or save that gives the attacker an advantage.
For a quick replay, freeze the image at the teammate’s first contact with the ball. Then draw an imaginary line through the second-last opponent. This is more useful than pausing when the pass arrives, because attackers and defenders may have moved several steps by then.
Which body parts count, and who is the second-last opponent?
For this decision, the head, body, and feet can count. The hands and arms do not. For players other than the goalkeeper, the boundary of the arm is the bottom of the armpit. If a player’s shoulder or knee is nearer the goal line, that body part can put them in an offside position; an outstretched hand cannot.
The second-last opponent is not always the last outfield defender. Officials count all opponents, including the goalkeeper. If the goalkeeper has moved up the field, another opponent may be the last player between the attacker and the goal, and the second-last opponent may be farther forward. The test is based on the two opponents nearest their own goal line, not on which player looks like the “last defender.”
Officials compare the attacker with the ball as well as with the second-last opponent. An attacker can be ahead of the second-last opponent but still onside if the ball is closer to the opponents’ goal line than the attacker. This often happens when a player runs onto a pass played forward past the defensive line.
The attacker’s feet do not need to be planted on the ground for the comparison. A part of the head, body, or feet that can legally play the ball is what matters. In practice, televised replays use the relevant body parts and a calibrated line; a casual viewer can apply the same principle without needing a perfect measurement.
When a player in an offside position is penalized
A player in an offside position is penalized only if the referee judges that the player becomes involved in active play. The Laws group involvement into three practical situations.
Playing or touching the ball
The clearest case is an attacker receiving or touching the ball after a teammate played it while the attacker was in an offside position. It does not matter whether the attacker meant to be there. If the player’s position and later involvement meet the rule, the referee awards an indirect free kick to the defending team.
Interfering with an opponent
A player can be penalized without touching the ball if their position affects an opponent’s ability to play it. Examples include clearly blocking a goalkeeper’s line of vision, challenging an opponent for the ball, or making an obvious action that affects an opponent’s ability to play it.
Simply standing near a defender is not automatically an offense. The question is whether the player actually challenges, obstructs, or otherwise affects an opponent. A nearby attacker who has no impact on the defender may not be penalized, even if they are in an offside position.
Gaining an advantage from a rebound or save
An attacker may be penalized for playing the ball after it rebounds or deflects to them from an opponent, or after it comes back from a deliberate save. This applies when the attacker was in an offside position when a teammate last played the ball.
A shot saved by the goalkeeper is a common example. If an attacker was offside when a teammate took the shot and then plays the ball after the goalkeeper parries it, the attacker has gained an advantage from that position. The fact that the goalkeeper touched the ball does not automatically reset offside.
How rebounds and deliberate defensive plays differ
A defensive touch does not always reset the offside decision. The key distinction is whether the opponent deliberately played the ball or whether it merely deflected off them. A deflection or accidental rebound generally does not make an attacker onside again.
An opponent’s deliberate play can reset the phase of play, even if the opponent makes a poor pass or mishits the ball. In that case, an attacker who was in an offside position may play the ball without being penalized for the earlier position. However, a deliberate save is an exception: it does not reset offside.
A deliberate save means an opponent acts to stop a ball that is going into, or very close to, the goal. A goalkeeper’s attempt to stop a shot is the familiar example. A defender’s emergency block near the goal can also count as a save. The rule prevents an attacker from benefiting from an offside position simply because a defender tried to stop a goal-bound ball.
Officials judge whether a play was deliberate by looking at the circumstances. They consider things such as whether the opponent could see the ball, had time to coordinate their body, and was able to control the ball or make a pass. A player who stretches awkwardly at a fast ball may still deliberately play it; a ball that only clips a player with no real chance to control it is more likely a deflection. The outcome alone does not decide the question.
| What happened to the ball? | Does it usually reset offside? | Practical reading |
|---|---|---|
| Opponent deliberately plays or passes the ball | Yes | An earlier offside position is generally not carried into the opponent’s deliberate play. |
| Ball accidentally deflects off an opponent | No | The original teammate’s touch remains the relevant moment. |
| Opponent makes a deliberate save | No | An attacker in an offside position can still be penalized for playing the saved ball. |
| Ball comes directly from a goal kick, throw-in, or corner kick | Offside does not apply directly | A player can receive the ball directly from these restarts without an offside offense. |
How offside works at restarts and in different areas
A player cannot be in an offside position in their own half. If the player is level with the halfway line or still in their own half when a teammate plays the ball, the position test is not met—even if they run into the opponents’ half to collect the pass.
There is no offside offense when a player receives the ball directly from a goal kick, throw-in, or corner kick. “Directly” matters: the exception applies to the player who receives the ball from that restart. If a teammate then touches the ball and plays it on, normal offside rules apply to the next pass.
A goal kick is often misunderstood because the ball may travel a long distance and defenders may be far upfield. The attacker can be beyond the defenders when the ball is kicked and still receive it legally, as long as the ball comes directly from the goal kick. The same basic exception applies to a direct throw-in or corner kick.
Common examples that clear up close calls
The attacker runs past the defense after the pass
If the attacker is onside when a teammate plays the ball and only then runs beyond the defenders to receive it, there is no offside offense. The player’s position at the moment of the pass is what matters, not where the player ends up.
The attacker starts beyond the defense but does not affect play
If a teammate sends the ball toward another player and the offside-positioned attacker neither touches it nor affects an opponent, the referee may let play continue. The attacker’s position alone is not enough to stop the game.
The attacker is level with a defender
Level means onside for the position test. If the relevant part of the attacker’s body is in line with the relevant part of the second-last opponent, the attacker is not nearer the goal line. A close call can look different from different camera angles, so the apparent gap on a television screen is not always reliable.
The goalkeeper comes out of goal
Do not automatically use the goalkeeper as the last defender. Count the goalkeeper and every other opponent, then identify the second-last opponent nearest the goal line. If the goalkeeper is well away from goal, an outfield player might be the opponent closest to the goal line.
The ball comes back off a defender
If the ball only deflects off a defender who did not deliberately play it, the original position still matters. If that defender had time and control to make a deliberate play, the offside phase is generally reset. If the touch was a save, however, the save exception applies.
What the assistant referee and VAR check
The assistant referee usually watches the defensive line and the moment the teammate plays the ball. The assistant raises the flag when they judge that an offside-positioned player has become involved in an offense. In close situations, the flag may be delayed briefly so the referee can allow the attacking move to finish before stopping play.
At matches using video assistant referee (VAR), the video team can review certain goals and other relevant incidents under competition rules. Offside review compares the attacker’s eligible body parts with the ball and the second-last opponent at the relevant touch. The referee still has to judge whether the player was involved in active play and whether a defender’s touch was deliberate or a save.
Not every match has VAR, and the available camera views differ. A referee or assistant may have to decide in real time with an obstructed view or a very tight line. That is why a decision that looks clear in one replay angle may be less clear from the official’s position.
A reliable way to review a disputed decision
- Identify the attacker who may be involved. Ignore players who have no effect on the play until you know which attacker is relevant.
- Find the last teammate’s touch before the attacker’s involvement. Do not begin with the moment the ball reaches the attacker.
- Check the attacker’s half. An attacker in their own half cannot be in an offside position.
- Compare eligible body parts with the ball and second-last opponent. Ignore hands and arms. Being level is onside.
- Look at what happens next. Did the attacker play the ball, challenge an opponent, obstruct their view, or benefit from a rebound or save?
- Check any defensive touch. Decide whether it was a deliberate play, a deflection, or a deliberate save. These are not interchangeable.
This order avoids the most common replay mistake: judging only the attacker’s position when the ball arrives. It also helps explain why a player who looks “behind the defense” is not automatically offside, and why a player who never touches the ball can still be penalized.
Frequent offside misunderstandings
- “Any attacker beyond the last defender is offside.” No. The attacker must be in the opponents’ half, nearer the goal line than both the ball and second-last opponent, and then become involved.
- “The goalkeeper is always the last player.” No. The rule counts opponents by position; the goalkeeper is one of those opponents.
- “A defender’s touch always puts everyone onside.” No. A deflection does not reset the phase, and a deliberate save is treated differently from an ordinary deliberate play.
- “The player must touch the ball to be penalized.” No. Interfering with an opponent can also count as involvement.
- “The player’s position at the end of the pass decides it.” No. The relevant position is measured when a teammate plays or touches the ball.
- “Offside is judged from the feet only.” No. The head, body, and feet can count; hands and arms do not.
One practical tip helps more than memorizing every edge case: first freeze the play at the teammate’s touch, then assess involvement separately. Keeping those two questions apart makes close decisions easier to understand and prevents a later movement from changing the original position test.
To judge how to check offside in football, focus on the attacker’s position at the teammate’s touch, compare the relevant body parts with the ball and second-last opponent, and then check whether the attacker becomes involved. A position beyond the defense is not an offense by itself.
For the next close call, pause the play at the passer’s contact before judging the receiver’s position. Then check for a deliberate defensive play, a deflection, or a save; that detail can change the decision.