Liverpool manager Jurgen Klopp has panned the concept of a new blue card in football and claimed law-makers IFAB have never come up with any good ideas.
Klopp joined fans and pundits in the backlash against the blue card and 10-minute sin-bin idea put forward by the International Football Association Board this week.
A broader trial had been planned - potentially in FA Cup games - next season after sin-bins had been introduced in some youth and amateur matches.
The idea was unlikely to be introduced into professional football for some time but Klopp made clear his belief a third card would complicate things.
'The actual situation shows we should keep it as simple as possible for the referees,' the German said at his press conference ahead of Saturday's home game with Burnley.
'It is a difficult job, often quite emotional when we speak about it because it's most often after the game.
'I think the introduction of a new card would just give more opportunities to fail as well because the discussion will be: 'It was a blue card, it should have been a yellow card, now he has 10 minutes off. In other times it would have been a red card, or would have been only a yellow. Whatever.'
'These kind of things just make it more complicated. They want to test it, I have no problem with testing but if that is the first step towards agreeing or already being sure it will happen, but I don't know about it.
'It doesn't sound like a fantastic idea in the first moment but actually I can't remember when the last fantastic idea came from these guys, if they ever had one - IFAB. I am 56, nah, never.'
The Daily Telegraph reported on Friday that plans for the blue card trial had been 'thrown into doubt' after strong resistance within the game.
Supporters had been up in arms over the idea, with some saying the game was 'finished' - while pundit Paul Merson said it would make football 'boring'.
The latest report claims that unrest over the decision was summed up by a statement from FIFA, which confirmed sin-bin trials would not include top-tier competitions.
'Any such trials, if implemented, should be limited to testing in a responsible manner at lower levels,' it read.
Further division on the concept was seen in UEFA too - with UEFA president Aleksander Ceferin declaring he would not allow a trial in the European Championship, Champions League, Europa League or Europa Conference League.
An announcement had been planned for Friday, but instead the trial looks to be in serious doubt - with the future of blue cards set to be debated at the next annual general meeting of IFAB next month, the report goes on.
Tottenham boss Ange Postecoglou, Everton's Sean Dyche, and Crystal Palace's Roy Hodgson are among the Premier League managers to have previously voiced their opposition to 'blue cards'.
Fans also took to X, formerly Twitter, to air their anger accusing the 'rich' of 'stealing our beautiful game' and being left baffled by the pointless move.
One fan on X said the didn't recognise the beautiful game anymore, while another said it would slow the game down even more.
A third added: 'Game is gone. If this comes in football is completely finished.'
It comes amid increasing concern from fans and coaches surrounding technology in the game, with a host of VAR mix-ups and mistakes seen in the Premier League this season that has angered coaches.