Sanchez was overlooked for selection against Bournemouth last weekend amid the ongoing uncertainty over his future, but boss Arsene Wenger has stressed that the forward's commitment while he is still at the club cannot be questioned.
Echoing these views, Xhaka claims that others can learn from Sanchez when it comes to putting in the hard yards on and off the field.
"To be honest, I don't know really what's true and what isn't," he told Sky Sports News. "We're humans as well and we read things like you do. Alexis is an important player for us, he's got class which he shows every week, and I will be happy if he stays.
"If he stays or goes? I don't know what's going to happen. At training, he's always an example for many people because he always wants to win no matter what we are doing - a big game or a small game. I think that's something that characterises him."
Sanchez has scored 60 goals in 122 games for Arsenal during his three-and-a-half years at the club.