Trying to think who these players are. Edozie and Aribo seem to have been sidelined so they're obviously prime suspects. Players who are out on loan are unlikely to be the cause of any current problems.
Breaking down the rest of the squad.
These players have effectively only joined this summer so probably aren't the cause of any problem: Roerslev, Azaz, Scienza, Quarshie, Fellows, Jander, Matsuki, Jelert, Long, Downs
These are too young to be the problem: Robinson, Sesay, Bragg
These have either played well or don't seem the type not to be trying: Stephens, Armstrong, Stewart, Wood, Charles, Fraser
These I'm not totally sure. Some may not be good enough but I don't see too many obvious signs of an attitude problem: McCarthy, Edwards, Bazunu, Welington, Manning
Which leaves Downes, THB and Archer. I could see all of them being annoyed at not playing and thinking they're better than they are, although I'm not sure if that's fair on Downes because Alfie House keeps saying he's been more affected by that e coli infection than I expected. So who knows.
Thinking about it, Fraser has clashed with coaching staff in the past so maybe he's more likely than I first thought. Could be a player who's fine on the pitch but not so much off it.