I'd question whether he's got the desire to succeed at this point.
Chelsea signed him very young, after 1 appearance here as a 16 or 17 year old. Since then he will have been on tens of thousands per week, and despite several loan moves, he's never really got people talking about him anywhere. He went for the money, and it must be hard to keep the hunger to succeed if he looks at his bank balance.
We do tend to give young footballers too much too soon in this country, and so they never fulfil what they are capable.