How VAR Actually Works: A Technical Breakdown

Inside the VAR room: the technology, protocols, and decision-making process behind football's most controversial innovation.

By James Mitchell•8 min read•2026-05-15

What Is VAR?

Video Assistant Referee (VAR) is a match official who reviews decisions using video footage. Introduced to the Premier League in 2019, it remains the most debated addition to football.

The Four Reviewable Situations

VAR can ONLY intervene in four categories:

Goals: — was there an offside, foul, or handball in the buildup?

Penalty decisions: — should a penalty be awarded or was one wrongly given?

Direct red cards: — was it a red card offence?

Mistaken identity: — was the wrong player penalized?

VAR cannot review yellow cards, throw-in decisions, corners, or subjective free kicks outside the penalty area.

Inside the VAR Room

The VAR hub (in the Premier League, located at Stockley Park) contains:

12-16 broadcast camera angles per match

2 dedicated offside cameras (tracking body positions)

Hawkeye goal-line technology integration

A team of 4: the VAR, Assistant VAR (AVAR), a replay operator, and a technical assistant

The Decision Process

Step 1: Incident Occurs

The VAR monitors all play continuously on multiple screens.

Step 2: Check Initiated

If the VAR spots a potential "clear and obvious error," they initiate a check. The on-field referee is notified via earpiece.

Step 3: Review

The VAR reviews available angles. For factual decisions (offside), they make the call directly. For subjective decisions (foul), they advise the referee.

Step 4: Recommendation

The VAR either confirms the original decision or recommends a review.

Step 5: On-Field Review (OFR)

For subjective decisions, the referee is invited to the pitchside monitor. For factual decisions (offside lines), no OFR is needed.

Semi-Automated Offside (SAOT)

Introduced in 2022-23, SAOT uses:

Component	Function
12 Hawk-Eye cameras	Track ball position 500 times/second
Limb-tracking cameras	Monitor 29 body points per player
AI algorithm	Calculates precise offside position
3D animation	Creates visual for broadcast

Average decision time: 15 seconds (vs 70 seconds with manual VAR lines).

Why VAR Remains Controversial

Consistency: Different referees interpret "clear and obvious error" differently

Celebration killed: Goals disallowed minutes after celebration

Subjectivity remains: Handball and foul interpretations still vary

Time delays: Average of 4 minutes added per match in stoppages

The 2026 Improvements

IFAB and the Premier League have implemented:

Automatic offside alerts — flag stays down, VAR confirms within 15s

Audio transparency — referee-VAR conversations broadcast to stadium

Challenge system (trial) — each team gets one challenge per half

Time limits — maximum 60-second review window for non-offside decisions

Written by James Mitchell, based on PGMOL protocols and IFAB VAR handbook 2025/26.

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