The 27-year-old has been in exceptional form since his return to Italy, and he is close to guiding Inter Milan to their first Scudetto in years.
Chelsea invested heavily in the signing of Timo Werner at the start of the season, but the German forward has failed spectacularly so far.
There is no doubt that the Blues need to sign a quality goal scorer in order to challenge the likes of Manchester City for the League title next season.
Lukaku initially struggled to make his mark at Chelsea due to his tender age and the lack of opportunities.
However, the Belgian went from strength to strength after that, and he made his mark at every club since leaving Chelsea.
The likes of West Brom, Everton, Manchester United and Inter Milan will all remember him as a reliable centre forward who scored consistently.
The Belgian has 27 goals (in all competitions from 40 matches) to his name for Inter Milan this season, and it can be interesting to see how he feels about a return to Stamford Bridge.
Previously the player has revealed that he has unfinished business at Chelsea, and he could be open to a return.
Lukaku is a key player for Antonio Conte, and he is integral to the former Chelsea manager’s system at Inter Milan. Selling him would severely weaken the Italian giants, and it remains to be seen whether they’re willing to sanction his departure in the summer.