If they do prove to be disruptive then Pep simply won't have them anywhere near the 1st team of which we are already seeing with Nasri & Yaya. I wouldn't be surprised if they stay with us but don't feature at all, even in the league cup. What is it to Pep if they never play a game for us again if they aren't part of his thinking. If the players in this situation had any nowse about them whatsoever they would concentrate on playing their way out of the club with their stock as high as possible.
Pep has no doubt already made his decisions (Likely before he even started on his 1st day) and has back up from the club to do how he sees fit. He is a very experienced and astute man and has dealt with some of the worlds best players and their personalities so it's not something new for him to have to deal with effectively.
One thing we are seeing for sure is just how well he is dealing with this situation and it's fascinating to witness...