I don't really agree, it wouldn't amaze me if something like this did happen. To me it will depend on what the player wants. If decides he wants the move then, I think the club, in a similar way to Knocky will sanction it, given the fierce competition for places in his position.
So you wouldn't be amazed if a player who has:-
Started most pre season games.
Started the opening game of the season.
Has had praise heaped upon him from his new manager.
Would leave the Premier League for a footballing backward like Greece.
Is your name Hector Projector?
Not only that though would be sanctioned by the club knowing it is removing a player from it's 25 man squad with absolutely no way to replace him.