Romelu Lukaku’s first major trophy of his career came with Inter Milan, where he played a key role in helping the Italian club win the title last season.

Months after helping the Nerazzurri achieve success, the 28-year-old left the San Siro and returned to Chelsea in August.

The Blues allowed Tammy Abraham to seal a permanent switch to AS Roma, just days after the Belgium international’s arrival at Stamford Bridge.

Lukaku has scored four goals in all competitions for the Blues and is currently the first choice No.9 for Thomas Tuchel. Abraham, on the other hand, has managed four goals and three assists for José Mourinho’s side.

Italian journalist Sandro Sabatini is of the belief the Champions League winners made an error in allowing the England international to leave following Lukaku’s arrival at the west London club.

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Sabatini made these claims when discussing Mourinho leading The Friedkin Group’s project at Roma.

“With Friedkin’s arrival there was a new hope in Rome, a newfound enthusiasm. With Mourinho’s move, Roma fans have started to believe in something again,” Sabatini told Radio Radio, as relayed by FcInter1908.

“So far only one false step has been made, that of [defeat to] Verona, which the team must be forgiven for. For the rest, they play well, in perfect Mourinho style.

“Now the big shot: I think, in a while, Chelsea will regret having taken Lukaku and giving Abraham away.”

Both Tuchel and Chelsea will be hoping Lukaku manages to have a successful second spell at Stamford Bridge.