Bayern Munich CEO Karl-Heinz Rummenigge has criticised UEFA's decision to not use video assistant referees (VAR) in the Champions League and Europa League from next season.
VAR has been trialled in competitions including the Bundesliga and Serie A this season, but UEFA president Aleksander Ceferin told the organisation's congress there was not yet sufficient confidence in the system to implement it in its two main tournaments.
However, Rummenigge said he believed VAR would eventually become established in the Champions League.
"To be honest, I regret this decision, because I have seen in the Bundesliga that referees are now making their decisions considerably more reliably and also more fairly than we have often experienced in the past," he told Bayern TV.
"Unfortunately, that's how it is now. But I am convinced that VAR will also establish itself in the Champions League -- quickly, I hope.
"Referees are provided with positive support and the game becomes better, fairer and more serious."
Bayern felt they suffered from questionable refereeing in last in last season's Champions League quarterfinal second leg against Real Madrid.
Arturo Vidal received a second yellow card for what appeared to be a clean tackle on Madrid's Casemiro as 10-man Bayern lost at the Bernabeu after extra time.
Rummenigge said after the game that his side had been "cheated" by the officials, while Vidal called it a "robbery" and Thomas Muller felt Bayern played "10 against 14."
The Bayern CEO said he believed his club would have progressed with the benefit of VAR.
"I'm convinced that a game like the one we unfortunately experienced last year in Madrid would have ended with a different result, with different decisions," he said.
"VAR completely rules out such decisions like those that were made at our expense in Madrid."
However, Rummenigge added that he was glad FIFA had decided to use VAR at the World Cup after a trial period at last summer's Confederations Cup.
"I'm pleased that FIFA is more innovative than UEFA -- usually it is the other way around," he said.