Yeah right, lets do a Zlatan Ibrahimovic again. Lets sell one of our best players to a direct rival so he can bring them titles while we're fighting for a CL spot.
It's simple, he should be told that he'll get the pay rise when he proves that he deserves one. If he doesn't accept that and he starts doing everything in order to be sold then we sell him but not to Milan or Inter.
If he accepts that and starts doing everything to deserve the pay rise, then it's a win-win situation both for Juve and Amauri.