If this guy behaves like this with LVG, he wont play for even 1 minute.
With LVG, the player must show a good attitude and be good in training.
The main issue though, is that he wasnt good enough for Chelsea (for a whole range of reasons). We want to beat Chelsea next year (and beyond), so I'd prefer to avoid Chelsea rejects.
And before we raise the subject of Mata - he was voted Chelsea player of the year, a year earlier, so he was a clearly a great player, albeit working with a manager who could not accommodate him in his system.