Brighton & Hove Albion's Lewis Dunk was sent off against Manchester United after an intervention from VAR.
The Albion man was shown a yellow card after pulling Anthony Elanga back.
However, following Man Utd players' furious reaction, VAR got involved and the yellow card was replaced by a straight red card.
This is how Potter reacted to the intervention by referee Peter Bankes and VAR Jarred Gillett.
"It was a yellow card live, Webster was there on the cover. It is not clear and obvious. I don’t understand the intervention," he said.
Asked about the pressure from the Red Devils on Bankes, boss said.
"Asking the question you are answering the question. I don’t blame them I am not being critical it is what it is.
"They have to do their bit for the team but you need the referee and VAR to make the calls independently."
“I thought we were the better team in the first half, I was really happy with our performance, the attacks Man United had were from our giveaways but it’s not easy here to control their transitions, they attack big spaces really well," said Potter.
"We don’t start the second half well enough, we got punished with a world-class finish from a world-class player, then a controversial red card and it was about us trying to hang on, we rode our luck in that period.
"We gave ourselves a chance, Jakub hit the bar and Danny had that header. I’m proud of the performance."
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