Demba Ba has expressed his sadness and anger after Inter's Curva Nord ultras penned an open letter to Romelu Lukaku over allegations of racism against Cagliari supporters.
During his second outing for the Nerazzurri since a club-record move from Manchester United at the start of August, Lukaku was presented with the chance to score his second goal of the season from the penalty spot.
The Belgian striker scored from 12 yards to give Inter a 2-1 win at Cagliari but was subjected to monkey chants from a section of the home crowd before and after the spot-kick.