He is a good player and can play various roles centrally but he's not a elite player and most likely never will be. Personally I wouldn't pay more than £30m for him. But if we did sign him, he'd be a very strong squad player and would be a big upgrade on Lingard and Pereira in the #10/AM role.
Van der beek and Soumare would represent a excellent transfer window for us.
Sadly to say, if 30 million is his value, the club would have to pay and extra 30 million for Elite club premium and inflation.
He will come to us for 50-55 million. Pretty much like Fred.