That's the claim of German journalist Raphael Honigstein.
Honigstein, who is working with Per Mertersacker on his new autobiography, has revealed just how much the Chilean was disliked at Arsenal.
"They really felt he was just playing up for the camera.
"He was doing all these things like 'Oh, I'm trying! What are the rest of you doing?!'
"Arsenal put up stats inside the dressing room after every game showing kilometres run, the passing etc.
"Sanchez would regularly come out with the lowest mileage – by a big distance."