Chelsea are taking a big risk Lukaku did not work out for them before and it is not certain that Lukaku is a better player now than he was then because the league is different. Italian league is not as competitive as the Premier League and the Premier League is more aggressive style of play which Lukaku will be used to but he will not be able to bully as many players as he did in the Italian league. I do not think he is one of the best players in the world like alot of people here are saying. I think he is a above average player who is built perfectly for a aggressive league but has been playing in a lower standard league and that is why he has looked better than he is.
If Chelsea do buy Lukaku what happens to werner? They paid Werner 50 million to come to Chelsea and I do not think many teams will be interested in signing him unless it is half that amount. I do not see Chelsea playing with two up the front because of Mason Mount and Kai Havertz.