This season, Everton have been managed by Koeman, Unsworth and Allardyce. Koeman of course brought Klaassen here and with the Dutch connection I thought he'd be a key player but very early on Koeman used him less and less until he was just simply someone taking up space on the subs bench. Unsworth didn't seem confident to utilise him when he was caretaker manager and now Sam Allardyce does not include him.
I think this is very much a case of Klaassen not settling or adapting to the English game and none of the three managers have been impressed by him. I expect he will be on the move in January, at least on loan to another club.