It's difficult to see how any EPL chairman would want to pay more than £10million cash for a player who is not playing regularly. IMO the likely scenario is a structured offer, which means that we wouldn't have the funds available to replace him.
From Saido's point of view, surely, it's in his interests to ensure he's visible for selection for the England Euro's squad, If selected, he could put himself in the shop window for a number of European, as well as our own EPL teams.
On that basis, I could see Saido staying with us to the end of the season.