I'd go ahead and replace him while playing hardball, saying he's under contract for two years, and holding out for more.
I know that we won't handle it like that. But, it's been clear that he thinks he can do better than Everton. I don't blame him. It isn't that I don't think the world of Everton. I just think, because Lukaku has been nailed on as the next big thing since he was a child, he's had it in his head that he's destined for greatness on the world stage. He doesn't work as hard as he should. He doesn't seem to worry about the rest of the team. I don't think he's one for long-term projects. He wants to win. He wants to score. And, he wants glory. I think the biggest problem with Lukaku is that he believes he deserves these things. And, so he goes about achieving them very cheaply.