Video assistant referee (VAR) has been used in some FA Cup and League Cup ties, but has often resulted in controversy and confusion.

Instead, top-flight clubs agreed that advanced testing will continue until the end of the 2018-19 season.

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Squiggly lines appeared on-screen as an offside decision was settled during Manchester United’s victory over Huddersfield Town in the FA Cup, while England debutant James Tarkowski felt aggrieved after conceding a last-gasp penalty via VAR consultation against Italy in a friendly last month.

Fans in the stadium have complained they are left completely in the dark while a decision is made, with communication a priority for the Premier League as tests continues.

VAR is in use in the Bundesliga and Serie A, while the technology is set to be used at the World Cup in Russia this summer.

WHAT IS VAR USED FOR?

Match officials can refer to VAR for guidance in four situations:

Awarding goals

Penalty decisions

Red card decisions

Cases of mistaken identity

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