VAR has been used throughout the league season in many countries on a trial basis, including the Bundesliga, Serie A, Portugal's Primeira Liga, MLS and the A-League. It has also just been introduced in Brazil and La Liga will use it from next season.
English football only starting its own trials in January in domestic cup competitions and it has seen many controversial moments, but the impact has been largely positive over the long-term in other leagues.
However, UEFA has already stated it will not use VAR in the Champions League or the Europa League next season, while the Premier League is not expected to consider introducing it until 2019 at the earliest due to ongoing confusion about how it is implemented.
More to follow...