Manchester United boss Erik ten Hag cannot guarantee Harry Maguire staying this summer.
Maguire failed to secure regular football this past season.
"No-one would be happy with this situation," Ten Hag told The Times.
"He is not as well. He trains always on best levels, so with 100% effort.
"So he handles that situation well and he's in that manner and in his captaincy he's important for the squad."
Ten Hag added: "He has high competition there [at centre-back] with Raphael Varane, who's fantastic.
"Let's say I'm happy he's here and when we needed him he did his job. But it's also a decision he has to make."