He's never actually said it but with the things he has said, with the way he is trying to angle a move out of the club, with the way he says he's now a complete striker, with the way he was complaining about Chelsea always signing strikers when the D. Costa rumours were very strong... Just put two and two together and you'll see that that is probably one of the main reasons as to why he wants to go (in my honest opinion anyway - not saying that this is factual). Thing is, I actually want him to stay and have said on numerous occasions he'd be a great second option here but it looks like he doesn't want to accept a role like that. So in that sense, yes, selling him is the best option.