Other than the fact he is obviously surplus to requirements and being actively shopped around? Because that will obviously hugely affect his value, as will his high wages and the fact that we realistically aren't going to sell him outside of England, then there are only a small number of clubs who need a keeper. We'll do well to get £20m for him imo, can't see a club at our level interested in buying him. Maybe Everton, West Ham, then you're looking at very ordinary premier league sides beyond that, unless Liverpool want him despite buying a new keeper already. It's a tough sale