Manchester United lost 2-1 to Young Boys on Tuesday night after Aaron Wan-Bissaka was sent off. Jesse Lingard also made a big mistake in the run-up to the late Young Boys winner.
Captain Harry Maguire said United needed to rule out the mistakes.
“Of course, discipline is a big part of tournament football,” said Maguire.
“If this was a knockout game, for example, and we are eliminated from the competition because we are reduced to 10 men, I am sure that everyone will kick themselves.
“It’s lucky that it’s the group’s first game and that we have plenty of time to recover from it.
“Obviously, when it comes to Jesse, no footballer likes to make mistakes, but that’s an integral part of the game.
“We are people, every footballer makes mistakes, we will learn from them, he will learn from them.
“He’ll pick himself up and be ready on Sunday because that’s part of football.”
