Manchester United captain Harry Maguire is expected to leave this summer.
Ten Hag signed Lisandro Martinez over the summer, while four-time Champions League winner Raphael Varane is also a stalwart in defence.
Sky Sports reporter Dharmesh Sheth has ruled out an exit next month but can see Maguire leaving at the end of the campaign. He said: “I can't see it (Maguire leaving) happening in January. There's no international tournament in the summer.
I can see Harry Maguire staying at United until at least the summer. But, if he is in a position where he is not getting the football he wants, Gareth Southgate will then look at it and think, 'You need to be playing regularly'. I can see something happening next summer.
“He's the captain and he's not playing. I can see something potentially happening in the summer unless there is a huge turnaround."