Can't blame the lad for joining Chelsea though, he was maybe 21 at the time, his agent will have been egging him on: 'course they'll play you Vic, they wouldn't blow £10m for nothing' (rubs hands together at the thought of his cut)...
He's had what, 3 managers at Chelsea since he signed? Went out on loan this year to try and prove himself / get some game time. I wouldn't say he's a mercenary, just young and hungry. There might be no truth in this anyway, but Roberto will know him inside out so if it is true then I'd be quietly optimistic. But as said, only at a relatively (compared to what Chelsea paid) low fee