I don't think Atsu would be quite as expensive as they say. I don't see him going anywhere just yet. But, if we had him on the wing and Pienaar in the middle, that would be awesome. This guy would bring so much speed to our side, without sacrificing technical ability.
The guy's been held prisoner by MLS and the Galaxy. And, let's not forget, while this may be his career, it's also a game. If he's not allowed to enjoy himself, playing a game that he's spent his life enjoying, I can understand his behavior.
Don't get too worked up. "Surgery" just means stitches, here, more than likely. It'll keep him out a few weeks though, since stitches in a place like that are problematic.
Here's the Moyes quote from the OS: