I think we should keep him, he's a good player, as we saw at the end of last season.
He's a young German international who's improving, to replace him would cost £30-40 million and we'd have to pay whoever we sign the £100K a week anyways.
I'd like to give Can a go in a back 3 alongside Lovren and Matip, he'd be good cover when the fullbacks push on leaving our CB's isolated, he could pick up the ball at CB and press forward into MF.