Vidal said Kassai robbed Bayern of a chance to go through to the semifinals for the sixth straight year.
“When Madrid got scared, the referee began his show," the Chilean said. "This robbery can’t happen in the Champions League. We felt it a lot and you start to wonder a bit. We wanted to go through and there’s a lot of anger in that a match of such intensity is decided by the referee. He made a lot of mistakes and knocked us out of the Champions League."
Vidal's coach, Italian Carlo Ancelotti, agreed with him.
"The referee had a bad game," he said. "Full stop. He was worse than our performance."
Ancelotti went on to say that he was OK with mistakes sometimes happening but not the series of mistakes. (Besides the Vidal yellow card and two Ronaldo goals, there were questions about both Bayern goals and the decision not to send off Real Madrid midfielder Casemiro.)
“In a quarterfinal, there has to be a referee with more quality,” Ancelotti said. “They are trying, but it is the moment to bring in video referees. There are too many errors. In some decisions, there is a lot of doubt, but there was no doubt here. You did not need to see a video to see that Vidal got the ball. I saw it straightaway.”
There are two problems with Ancelotti's statement.
The first one is the easy one: Just because Vidal "got the ball" doesn't mean it was a foul or foul deserving of a yellow or red card.
More generally, video assistant referees might have reversed the two Ronaldo goals for offside, but they would not have reversed the yellow card to Vidal.
VAR will be used to monitor four categories of reviewable incidents:
-- goals (infringements such as foul, handball, offside);
-- penalty kicks (foul or no foul and inside or outside the area);
-- direct (straight) red cards; and
-- mistaken identity (in issuance of yellow and red cards).
Video will be used to determine whether a player deserves a red card -- but not a yellow card.