Inter Milan team-mates Andre Onana and Edin Dzeko had to be kept apart during their team's Champions League round-of-16 game against Porto.
The Nerazzurri hold a narrow advantage going into the second leg at the Dragao. Otavio was sent off for the visitors for two yellow cards, and Inter striker Romelu Lukaku delivered a late winner against the 10 men.
It was the second time this months that Simone Inzaghi's side have seen their on-field achievements overshadowed by issues between team-mates. Lukaku himself was involved on the previous occasion, with Nicolo Barella the subject of the Belgian's frustration in a game against Sampdoria.
