The VAR should have been used in the fourth-round loss to Manchester City according to the manager.
The technology doesn't come into use until the semi-finals because it's not available in lower league grounds.
He thinks that Erling Haaland should have been flagged in the sixth minute for trying to set up Cole Palmer.
The officials seemed to be relying on technology to give them an answer and missed a few decisions as a result.
At the start of the game, Haaland had a chance, but it was not taken. Do you not know? It was, yes. I will let you know. The direction the game takes is given by that.
It wasn't a flag up, and it gave you a bad feeling, even though it was an incorrect call.
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If we had VAR, the referees would be used to it and you wouldn't tell them not now. It looked like they were waiting for it in a few instances.
Everyone in the stadium was convinced that there were two incorrect decisions. We can't play them back, so we won't know.
If you play a competition and everywhere is VAR, why not? I know it's not possible on all levels, but why shouldn't we use it?
During the World Cup break, neither side played a competitive game, but on Thursday night they came back to play ferociously at the Etihad.
The slow start to the game saw Haaland allow in behind multiple times before finally poking Man City into the lead after 10 minutes.
After that, the Reds came back twice, but fell short due to two defensive mistakes.
The first 15 minutes were difficult for us. You never know what will happen in a game and you have to get used to it.
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We were not compact enough but we found a way back into the game and scored a wonderful goal.
All of the goals should be defended better. We don't switch on when they start their routine. We didn't have enough players to watch the ball. We had our moments.
The game was very intense. It's a lot to take from it.