He is still a regular in their side and at the very least will convince him to stay for the rest of the season.True, but his value will only decrease with each an every passing transfer window. So, if they don’t mind getting less or losing him for free in the future, then sure, they can hold on to him. He’ll probably end up disgruntled, leading to a dip in form, but they’ll still have him on their books, no matter how much his performances may decline.