Former Inter Milan coach Andrea Stramaccioni says Romelu Lukaku is benefiting from the system of Roma coach Jose Mourinho.

Lukaku scored twice in victory at Cagliari on Sunday. It was his seventh goal in eight games for the Giallorossi.

Stramaccioni said of the on-loan Chelsea striker: "The value of the player was known, but that he could have this immediate impact in a new team is something unexpected.

"In my opinion there is a lot in the coach's knowledge.

"There is a lot of possibility of playing in an ideal game system for him with which, let's remember, he won the Scudetto with Inter."