He hasn't directly said it but come on... Just read between the lines. What he said when the Diego Costa rumours were strong (Chelsea always sign strikers, many clubs are interested on me), when he says he's pretty much a complete striker now, when a few months ago his agent was speaking to Tottenham about a move etc... Just put it all together and it's easy to see why one would assume that Lukaku isn't ready to stay here as a number 2 striker. I actually want Lukaku to stay but with the way he's said things it seems like he wouldn't accept being number 2 here, so naturally Chelsea and Lukaku are both better off if we sell him.