What you need to know about video technology in football - and when we might see it in the Premier League

Football’s experimentation with video referees has been going on for a while, but last night’s friendly between France and Spain was the first time it has changed the outcome of a high-profile game – turning what could have been a 1-1 draw into a 2-0 win for Spain. First, French forward Antoine Griezmann had a headed goal disallowed for offside. Then in the second half, Spain’s Gerard Deulofeu had a disallowed goal reinstated after the video ref’s input.

The system has divided opinion. For some it’s long overdue, for others that it signals the death of football. But how does it actually work?

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