Karl-Heinz Rummenigge has accused the referee of "shafting" Bayern Munich in their Champions League defeat to Real Madrid.
The Bayern chairman was incensed after Cristiano Ronaldo scored a controversial hat-trick as Real overcame 10-man Bayern to seal a 4-2 win in Tuesday's quarter-final second leg.
Real Madrid triumph despite controversy
The holders won 6-3 on aggregate, but Bayern took the tie to extra time after it finished 2-1 to the Germans after 90 minutes, thanks to Robert Lewandowski's penalty and an own goal from Sergio Ramos.
Bayern had Arturo Vidal sent off on 84 minutes and the Germans were further incensed as replays showed Ronaldo's second and third goals, on 105 and 109 minutes, were clearly offside.
Rummenigge turned his anger on Hungarian ref Viktor Kassai during his speech to the Bayern squad in Madrid.
"For the first time, I've got some sort of mad rage inside me, because we had a shafting. We have been shafted in the truest sense of the word," fumed Rummenigge during the team banquet.
"The team was in ruins in the dressing room.
"It was an unfortunate, undeserved and bitter defeat."
Ancelotti calls for VAR
Bayern's coach Carlo Ancelotti has said UEFA should introduce video technology after the controversial quarter-final tie.
"In a quarter-final, you have to put a better referee, or it is the moment to introduce video refereeing, which is what UEFA are trying, because there are too many errors," said the Italian.
Vidal was dismissed for his second booking and to add injury to insult, Bayern's goalkeeper Manuel Neuer is sidelined for the next eight weeks after fracturing his foot while trying to save Ronaldo's second goal.
Vidal fumes at Kassai
Chile midfielder Vidal directly blamed Kassai for their defeat.
"A robbery like that can't be allowed to happen in the Champions League," fumed Vidal, who scored Bayern's only goal in the 2-1 first-leg defeat.
"They are two offside goals, the bad red card, Casemiro should have been sent-off before me and it makes a big difference," Vidal added as Real's Casemiro could have also been dismissed for a second booking on more than one occasion.
"There is a lot of anger. A game of such high intensity can't be decided by the referee."