"I have supported Chelsea as a kid and now to be back and try to help them win more titles is an amazing feeling."
Less than 12 months later the Belgium striker is leaving the club in arguably one of the most expensive transfer mistakes in Premier League history.
Lukaku's return to Chelsea on a five-year deal cost the Blues a club-record £97.5m, but he departs 10 months later on an initial loan deal having failed to make the impact both he and the club would have hoped for.
His signing was supposed to turn Chelsea into Premier League title contenders so how, and why, did it all go so wrong?