Slot said: "I don’t think we have a concern at centre-back. In terms of depth? I think Ryan showed today, by the way, that he can play in that position. He did it last season as well. Although we all know we favour him as a No.6. Wata [Endo] can play there. Joe Gomez only has a minor injury, he has been good for us last season as well. We have enough options left. But it’s true that Jarell Quansah left and we haven’t replaced him yet."