Well he's done very well whilst he's been here, and been an important contributor for our successes. Maybe even he can help us out through the remainder of this season, at the very least as squad depth.
Can't keep them all. Eventually someone will want to leave. Every top club has somebody eventually when you get enough high quality players over a period. Ronaldo at United, Hazard/De Bruyne at Chelsea, Sterling at Liverpool, Henry at Arsenal, Kroos at Bayern, Eto'o/Touré/Neymar at Barcelona, Kaká at AC Milan, Zidane at Juventus, Robben at Real Madrid etc..
I'm grateful. Hopefully we do better with Sané treatment wise than what Liverpool did with Sterling.