Chile midfielder Vidal was shown a second yellow card by Kassai in the 84th minute for what was a clean challenge on Marco Asensio, tilting the game in Madrid's favour as they entered extra-time trailing 2-1.
But Arturo Vidal was sent off with a controversial second booking, and they eventually lost 4-2 - 6-3 on aggregate - to miss out on the biggest club prize in Europe.
"When he has to be, he is".
Cristiano Ronaldo defied boos from Real Madrid's infamously demanding fans to "demolish" Bayern Munich and set another personal milestone with 101 Champions League goals. "And for the people who have helped us in the Bernabeu".
Bayern boss Carlo Ancelotti called for the introduction of video refereeing after Arturo Vidal was harshly sent off with the tie delicately balanced at 3-3 on aggregate with five minutes remaining of normal time.
The Bavarians cancelled out their 2-1 quarter-final first- leg defeat to take the game to extra time in Madrid.
"On top of that, you have players like Lionel Messi and Cristiano Ronaldo".
"When Madrid got scared, the referee began his show", Vidal said after the game.
OU Awarded Multiple NCAA Postseason Events
The 2002, 2007and 2016 regionals have all been held at the LSU home course, the site of the 2021 regional, the University Club. This will be the first time in school history the men's or women's teams in either sport will play host to the championships.
Bayern Munich have lodged an official complaint with UEFA with regards to the actions of the Spanish police during Tuesday's Champions League match at Real Madrid.
Bayern then conceded three in extra-time, two of which were scored by Ronaldo as he completed his hat-trick, but both should arguably have been ruled out for offside, per The Telegraph. "But now I'm feeling good and the team has been playing really well, that's what's important".
Bayern were left incensed, though, as Ronaldo's second and third goals were clearly offside. "(Bayern president) Uli Hoeness and I, we've taken many blows.
"There are few players who are always there in the key moments and the fans will be grateful for what Cristiano has done here". Those numbers. Those scandalous numbers you think you can never achieve, the appearances, the goals, and that to me is where it's going.
"I always give my all and when I don't score, I try to work hard for the team".
Tuesday's match between Real Madrid and Bayern Munich was a wild one!
The contest was magically poised at that point, with each side boasting two away goals at the end of 90 mins.