Lukaku has rejoined Inter just a season after he signed for the Blues for £97.5 million.
He pushed for a move back to Italy following a disappointing campaign last season, having scored just 15 goals across all competitions.
Ahead of turning out for the Nerazzurri for the new season, Lukaku shared an eye-catching post on Instagram.
He uploaded a picture of himself on his phone, accompanied with the caption: "I'ma probably show you I'm solid first and if the energy ain't right.
"I'ma show you how easy it is to cut ties, no more tries. Gone..."
Now, the words are quotes from Moneybagg Yo's song 'Scorpio' - but some Chelsea fans interpreted it as a dig at his failed second spell at Stamford Bridge.
2 (Two) trophies at the age of 29 (Twenty Nine), with the ego of Ronaldo and not even 1% of his talent. pic.twitter.com/0Hs8ANTW9V— TLV (@TheLampardView) July 7, 2022
One tweeted: "Wait... isn't Lukaku only on loan which technically means he's still a Chelsea player? Why is he throwing shots at them?"
A second wrote: "An apology is what he should put out."
A third added: "This man has one league title to his name, where’s all this energy coming from."
Lukaku, who gave a bombshell interview that upset Thomas Tuchel and Chelsea fans last season, returns to Inter having enjoyed two prolific campaigns in Italy's top flight.
He scored a combined 47 goals in 72 league matches for Inter and helped them to league glory in 2021.
Featured Image Credit: Romelu Lukaku/Instagram/Alamy