His replacement, Simone Zaza, fired Torino in front on the stroke of halftime and Cristian Ansaldi doubled the visitors’ lead in the 62nd from the penalty spot after Ashley Young fouled Wilfried Stephane Singo.
Inter pulled one back just two minutes later as Lukaku’s shot came off the crossbar with Alexis Sánchez managing to fire in the rebound.
Lukaku then hit the post before turning in Sánchez’s cross.
And Inter’s comeback was complete six minutes from time when Lukaku converted a penalty after Achraf Hakimi was tripped in the area by Nicolas Nkoulou.
Inter sealed the match in the final minute when Lukaku ran down the left and rolled across for Lautaro Martínez to tap in.
Henrikh Mkhitaryan scored twice in an impressive first half for Roma after Borja Mayoral’s opener.
Mkhitaryan has now scored five goals in his last two Serie A matches.
Cesare Prandelli’s first match back in charge of Fiorentina ended in a 1-0 defeat at home to Benevento.
Also, Bologna won 2-1 at Sampdoria and Udinese beat Genoa 1-0.
Dampf reported from Rome.
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