As I said the Bundesligue isn't really much of a league, if players like Xhaka can stand out in it, it tells you everything you need know. He's a Wenger type player to be honest, weak mentally, weak physically, inconsistent, doesn't like to get stuck in or tackle, can't cross is happy to play anywhere.
Just not convinced with this guy, hope I'm wrong but since he's come to England he's been very very average, so much so Man U had to force him out of the door (they weren't even willing to wait until the summer to get rid, they saw this as too good a deal to get a world class player in return for a reject).
Also this guy needs to get himself down the gym, you can't survive in the PL with a build a slight as his, he needs to bulk up a bit and get some upper body strength as he has huge calves but a tiny little upper body, but then Wenger doesn't believe in his players going to the gym (no wonder they're always injured).