Everyone agrees Gana's game hugely improved in the second half of the season. He said something about 'knowing these types of club are watching me is good' or something. So it makes me wonder to what extent his form was due to his own motivation (with an eye for a summer move) versus Silva putting him in a more forward-thinking role. If it's mainly the former, and his hope that a club like PSG comes in for him doesn't materialise, there is a risk that we don't get the same performances from Gana at the start of next season.
The contract situation is potentially helpful. Say he runs that down and leaves next summer, we have him performing well for another year with his eye on attracting a good Bosman deal. We take that time to find the ideal replacement rather than doing it this summer when other issues are more pressing. If next season goes well, he might even end up staying again after that.