Sure, we'd heard the scouting reports and seen the YouTube footage, but how good was the then 18-year-old?
Well, after 12 months in England and a season spent largely on the bench, we were still none the wiser.
Lukaku was a mystery—until he joined West Bromwich Albion on loan, that is.
The 2012-13 season has been a great season for Lukaku.
His 13 Premier League goals for the Baggies make his 2011 transfer fee seem like loose change for Chelsea. He has come of age, living up to the hype that has long surrounded him.
Given his form in the Midlands, it's no wonder Lukaku has suggested he would like to remain at the Hawthorns for another season as he continues his development (via Daily Mail).
But will Chelsea let him?
The player has been compared to Didier Drogba by many and his reputation continues to grow. We will take a look at why Lukaku could prove to be the missing piece for the Blues next term.