Football · Beginner guide

Football Offside Rule Explained: A Fan’s Replay Guide

By Safiullah SoomroPublished 14 October 2026

A striker can look clear of the defence when receiving a pass and still be onside. The key is to check the correct moment, then ask whether the player became involved in play. Here is a practical way to follow a replay.

Offside position and an offside offence are different

Under IFAB Law 11, being in an offside position alone is not an offence. The position test concerns an attacker in the opponents’ half who is nearer the goal line than both the ball and the second-last opponent. Hands and arms do not count. Being level with the second-last opponent is onside.

The relevant position is normally assessed when a teammate plays or touches the ball, rather than when the attacker receives it. A player in an offside position is penalised when they become actively involved, such as playing the ball or interfering with an opponent. Blocking a goalkeeper’s view can matter even without a touch.

Use a two-part replay check

First identify the pass or touch being assessed. Then track the receiving player from that moment through the rest of the action. These are separate jobs. One still image may help with position, but the following movement helps explain involvement. Jumping straight to the moment of the finish can make a well-timed run look illegal.

Here is an original viewing exercise: imagine a winger waiting near the defence while a midfielder prepares a pass. The winger accelerates as the pass is made and reaches open space before the defenders turn. Pause first at the pass, then again at the reception. Notice how much the two pictures differ. The second image explains the success of the run, not necessarily its legality.

Why “the last defender” can mislead

Fans often count only defenders in outfield shirts. The law uses opponents, so the goalkeeper’s position also matters. Do not assume the goalkeeper is always the opponent closest to the goal line. Before discussing a decision, identify the ball and the second-last opponent rather than choosing the nearest defender by habit.

This is a helpful note-taking method for a confusing clip: write “pass moment,” “ball,” “second-last opponent” and “involvement” on four separate lines. Fill each line before deciding what the clip shows. If the broadcast angle does not show enough information, leave the answer open instead of claiming certainty from a cropped image.

Restarts and rebounds need care

There is no offside offence when receiving directly from a goal kick, throw-in or corner kick. A rebound or deflection does not automatically clear an earlier offside position; deliberate play by an opponent involves additional distinctions, including saves. Use the full law for those edge cases.

Three habits that improve match discussions

Watch the full sequence before reading comments. Social clips often begin after the decisive pass. Second, distinguish a position question from an involvement question: people may be arguing about different parts of the same decision. Third, wait for the official ruling rather than treating a commentator’s immediate reaction as the decision itself.

Try describing what you can actually see: “The clip begins after the pass,” or “The replay shows the attacker near the goalkeeper.” Such descriptions are more useful than accusing a player or referee when the evidence is incomplete. They also make it easier to revise your view when another camera angle appears.

Questions new fans often ask

Does running quickly behind the defence mean offside? Speed alone is not the test; check the relevant position and involvement. Can one screenshot settle every decision? No. It may omit the important touch or what the player did next.

For more context, explore our football guides and explanation of FIFA and IFAB. The examples here are invented viewing exercises, not descriptions of disputed real matches.

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