A player is offside if they are nearer to the opponent's goal line than both the ball and the second-last defender when the ball is played to them — and they actively participate in play. Simply being in an offside position is not an offence by itself.
What Is the Offside Rule?
The offside rule is Law 11 of the Laws of the Game as defined by IFAB (the International Football Association Board). Its purpose is to prevent players from simply camping near the opponent's goal waiting for long passes — it forces teams to build attacks with movement and timing.
At its core, the rule has two conditions that must both be true for an offside offence to occur:
Offside Position
The player is nearer to the opponent's goal line than both the ball and the second-last opponent (usually the last outfield defender).
Active Involvement
The player must be actively involved — interfering with play, interfering with an opponent, or gaining an advantage from the position.
Moment of the Pass
The position is judged at the exact moment the ball is played by a teammate, not when the player receives it.
Visual: Offside vs. Onside
⬇ Attacking direction
Common Offside Scenarios
An attacker is ahead of the last defender when their teammate plays the ball forward. They run onto the pass and shoot. Offside — the flag goes up.
Same situation, but the attacker's shoulder is level with the last defender at the moment the ball is played. Onside — play continues.
A player is in an offside position but doesn't touch or chase the ball, and doesn't block the goalkeeper's view. No active involvement — play on.
An attacker appears onside to the assistant referee, scores a goal, but VAR review using freeze-frame shows their armpit was ahead of the defender. Goal disallowed.
What Counts as "Active Involvement"?
This is where the rule gets nuanced. According to IFAB, a player in an offside position is only penalised if they are actively involved in one of three ways:
1. Interfering with Play
The player touches or plays the ball passed or touched by a teammate.
2. Interfering with an Opponent
The player prevents an opponent from playing the ball — for example, blocking the goalkeeper's line of sight or challenging for the ball.
3. Gaining an Advantage
The player gains an advantage from being in an offside position — for example, receiving a ball that rebounds off a post, crossbar, or even an opposing player, when they were originally offside.
Exceptions: When Offside Does Not Apply
The following situations cannot result in an offside offence, regardless of player position:
- Goal kicks
- Throw-ins
- Corner kicks
- Receiving directly from any of the above restarts
This is why teams sometimes score directly from a corner with an offside-looking header — if the ball was played directly from the corner flag, offside cannot be called.
The Role of VAR in Offside Decisions
Video Assistant Referee (VAR) technology has transformed how offsides are judged at the elite level. Controversial freeze-frame images — where a player's armpit, shoulder, or toe appears to be millimetres ahead of a defender — have sparked ongoing debate about whether this level of precision reflects the spirit of the rule.
As of 2025, IFAB has been reviewing proposals for a "daylight" standard, where only clear and obvious offside positions would be flagged, reducing the frequency of marginal calls. The debate continues.
Test Your Offside Knowledge Interactively
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