Well that's always a possibility, although without any actual indication of which club he favours it's a bit of a non-point at the moment. There's nothing to suggest he wouldn't be favourable to a move to Brendan's battleship.You're absolutely right, but will Sanchez make it happen? He could pull a Kagawa and refuse to move altogether.
If you were Sanchez and it was either that or fourth place for eternity, or one of your peak years out of the Champions League struggling alongside Fellaini and Phil Jones, it might actually sound appealining.
Of course I'm aware that he probably does fancy a move to Juventus, but throw in the Suarez situation (and how heavily Barca will be pushing him to move to Liverpool) as well as Juve's inherent lack of finances and I just can't see that one happening.