Sure, but it'd be better to sell Vitor Roque if you don't take a loss on him rather than have him rot on the bench or go on a loan which his agent have made clear is not an option.
Besides big teams don't loan out players they sign for a significant amount unless it's to get rid of them. A loan can go south very quickly as you have no control over the player's situation at his new club. Just look at Pablo Torre at Girona. Barca probably thought he'd play a lot there and that they'd take care of his development, but he hasn't really played much at all as their other midfielders have shined.
Well I am not in favor of a loan, since the player clearly has quality and a proper coach (not an amateur) can bring that out and develop him.
Given that this can't happen for one season, let's say, what do you do?
a) sell, splashing all money spent down the drain together with you beating competition to his signing, and enhance a direct rival in europe?
b) Convince him to get loaned
c) let him be even on the bench, as Xavi will leave, and a new coach will have other views on him
I say doing a) is simply suicidal for any club that wants to be serious
Even c makes more sense than a