Who's bending over? If Sane is turning up for training and doing his job then give him some game time, it's idiotic to freeze him out completely.
Why?
He. doesn't. want. to. be. here.
He's counting down the days until he's no longer a Manchester City player and you want to give him out medals for competitions we've done perfectly well in without him.
So he shouldn't be playing out of the principle, but there's a whole other reason which is that Pep couldn't trust him to follow instructions when he wanted to be a Manchester City player, how do you think he's going to do as a Bayern player in a City shirt?