The thing with him saying that, is that Pueta was at the club training after the 1st of July (he went to Turkey on the 17th). So that doesn't track. If the deal didn't go through, he should've been at Leverkusen a long time ago. If he did his ACL in training and the appeal was lost, they'd be **** out of luck, no chance they would just let a multi-million Euro asset just train with someone else. I honestly think Baz is just a bit clueless.
I just wouldn't let him train with us (if he still is) as he can't play anyway. As you say, if he gets a bad injury this will get very messy legally.