The first VAR decision in Champions League history was made on Wednesday night, with Ajax controversially having a goal disallowed at home to Real Madrid.
Ajax thought they had taken the lead after Nicolas Tagliafico captialised upon a mistake from Thibaut Courtois and headed the ball into the net.
However, the goal was subsequently ruled out, with referee Damir Skomina using VAR to deem that Ajax's Dusan Tadic was in an offside position.
Skomina took his time to assess the footage, and the decision was certainly a difficult one to make, with it not being entirely clear whether Tadic was offside.
Boos rang out from the Ajax supporters at the Johan Cruyff Arena after Skomina made the decision.
VAR is being used in the Champions League for the first time in the knockout stages of this season's competition.
There were no major incidents in Tuesday's games as Paris Saint-Germain beat Manchester United and Roma got the better of Porto.
GateWaye
154
The Perez effect: Madrid is ready to play with 12 players.
lopacdkn
92
Why did the referee insist on VAR when Ajax s or ed their first goal even when the Madrid players had not complain? Why did the referee refused to go and take a look at the VAR when Ajax players protested Madrid's second goal? Double standard. There was a foul in the build up to the goal, the defender fouled was in a good position to defend that and he might have done that. Madrid proved they're experienced and they're quality was clear. It was a difficult game for them but they were able to manage a win. Ajax played very well and would probably have carried the day if they had an experienced quality striker. In the coming couple of years, if Ajax are able to keep this current crop of players together, they will do great things in Europe.