A fee thought to be around £20m has been agreed between the clubs but Lukaku now needs to pass a medical and agree personal terms to finalise his move to Stamford Bridge.
The 18-year-old has revealed in the past that he is a Chelsea fan and on his Twitter page today he described the club as a "dream team".
When asked to name his favourite thing about Chelsea, he tweeted: "The fans, the players.. Its just my dreamteam." (sic)
"I think I am entering a team full of experienced guys and winners. And I'm very happy about that."
The sale of the 18-year-old striker was yesterday announced on the Belgian club's official website.