I'm thinking with the way things were developing, he maybe saw that he wouldn't get too much game time. The stronger the players we targeted, perhaps the more he thought he'd be on the bench more often than not. Probably got more chance of game time at Juventus.
Can think of no other reason why anyone would not want to be part of this revolution.
Only my opinion of course.
Klopp plays him at CDM most of the time. If Fabinho performs, he'll be the starting guy in that position and Can will rotate with him and two CM spots that are going to be disputed by Ox, Keita and potentially Fekir. Lots of competition.
Keita is hopefully going to cement his position as a starting guy really quickly. Ox IMO has qualities that Can do not have like speed and what seems to be an improving rocket right foot.
All in all, I think him worrying for his playing time is justified, but when you think of it, nobody plays as many games as a PL club in the CL. The amount of games is insane and injuries are too. Add to this the fact that we play a brand of football that requires a lot of rotation and rest because of the running and constant pressing. If he stays he would clearly have fewer minutes than this season, but he would still have a decent amount and a chance to fight for a spot.
I'm thinking maybe the wage Juventus can offer his also probably higher than what we can afford to give him.