why is he mentally weak ?, because he is probably aware he wouldn't get in the team. that doesn't make him mentally weak, that probably makes him a realist. when I went to work there wasn't one person who thought he'd get in the team.and again, it seems folks can't get around the fact the lad didn't want to sign for Chelsea. he isn't obliged to sign for a club he doesn't want to play for,surely that makes sense to folks.
ok, the crux is that he's cost the club millions by not signing a new contract, btw nobody knows for sure after yesterday whether he will or he won't, and lets not pretend that all the fault lies with the player, there is a management in place to deal with issues and contracts. they have seemingly messed up as much as anyone, it wasn't like they didn't see it coming, the injury hasn't helped either party or any potential buyers i'd have thought.
simple truth is a player didn't want to sign for a particular club for whatever reasons he had. he hasn't done it to spite anybody, he's not going to get pushed into a club because it suits his old employers, simple as,