Manchester United manager Ten Hag explains decision to substitute Mount

Josh Zirkzee replaced Mount after starting at Falmer Stadium.

"It was forced," Ten Hag said. "He mentioned an issue and I don't want to take the risk with him.

"I don't know how much of a worry it is, I can't say at this moment. But I think, when we have the good bench, and we can bring in Zirkzee, then don't hesitate. Bring Mount off and bring   a player who can have an impact."

In a separate interview with TNT Sports, the boss added: "It was a decision, he had some problems and he had an issue. We know the history of Mason, so we took him out."