I would agree that at 20-25m you likely keep hold.Depends how much we would get for him. I know Chelsea were sniffing in the summer so that would be the most logical in terms of getting an inflated fee.
I imagine everyone else would be put off by his injury record and we would not be able to get much more than 20-25, which I think is too risky to sell for that much. When fit and firing he is a top 10 striker in the league.
Like Mangala, 30-35m, different situation all together.