Football offside explained: position, involvement and exceptions

To understand an offside decision, ask two questions in order: where was the attacker at the relevant touch by a team-mate, and how did the attacker become involved afterwards? A still image showing a player close to goal answers only part of the problem.

The useful habit is to follow the pass, the receiving player and the next action as one sequence. Starting with the moment the ball reaches the attacker often leads to the wrong comparison.

Position comes before the offence

Under IFAB Law 11, an offside position requires a relevant part of the player’s head, body or feet to be in the opponents’ half and nearer the goal line than both the ball and the second-last opponent. Hands and arms do not count. Being level is not being ahead.

Position alone is not an offence. The law then considers active involvement, such as playing the ball, interfering with an opponent or gaining an advantage after a rebound, deflection or deliberate save.

Use the second-last opponent, not a job title

A common viewing shortcut is to look for the last defender in front of the goalkeeper. It works in many ordinary pictures but can fail when the goalkeeper has moved upfield. The comparison is with the second-last opponent, regardless of which opponent happens to be wearing gloves.

Try a hypothetical freeze-frame: one defender is near the goal line, the goalkeeper is further upfield, and the attacker is between them. Do not ignore the goalkeeper when counting the opponents. Identify the second-last opponent first, then compare the attacker’s position with that player and the ball.

Choose the right moment in the replay

For a team-mate’s play or touch, the law uses the first point of contact. A goalkeeper’s throw has a specific exception: the last point of contact is used. That timing detail matters when a replay moves a few frames forward or backward.

Watch the passer before following the runner. Once you have identified the relevant touch, use the rest of the clip to understand involvement. A player can move a considerable distance while the ball travels, so their eventual receiving position should not replace the earlier check.

A touch by a defender is not the whole answer

Law 11 distinguishes a defender’s deliberate play from a deflection and from a deliberate save. Those descriptions are not interchangeable. “It touched the defender” is therefore an incomplete explanation of the next decision.

For a useful replay discussion, describe what happened before naming the outcome. Was the defender able to control the action? Was the movement a hurried stretch? Was it an attempt to stop a ball heading into or very close to goal? Those observations are more informative than treating every contact as an automatic reset.

The direct-restart exceptions

There is no offside offence from receiving the ball directly from a goal kick, throw-in or corner kick. The word “directly” matters. A later team-mate touch creates a fresh situation to assess.

For example, do not stop following a short-corner routine after its first pass. Track the next touch and the players’ new positions. The fact that the move began with a corner does not settle every later action in the sequence.

A five-question viewing method

1. Which touch is the position being judged from?
2. Where are the ball and second-last opponent at that moment?
3. Which relevant body parts, rather than arms, are being compared?
4. How does the attacker become involved?
5. Does a direct restart or a particular intervening action change the analysis?

Camera perspective can make a simple-looking picture deceptive. Use the available replay and the official explanation where provided, while keeping the sequence intact. The aim is to identify the decision’s actual ingredients before arguing about a line on a frozen frame.

When the question goes to video officials, the VAR check-versus-review guide separates the original call, the check, a possible review and the referee’s final ruling.