Manchester United striker Romelu Lukaku has been accused of throwing a water bottle at Manchester City coach Mikel Arteta during yesterday's bust-up.

An all-in brawl sparked inside the players' tunnel after City's derby win.

Cadena Ser says Lukaku's shot caused a facial wound to Arteta in the post-match fracas.

Jose Mourinho had asked City stars to tone down their celebrations and was allegedly showered in milk and water after a furious row with Blues goalkeeper Ederson, although this claim is refuted by City chiefs.

The Mirror reports Lukaku was said to be involved in the incident, along with goalkeeping coach Silvino Louro.

Up to 20 people became embroiled in the fracas which occurred in the narrow tunnel outside the away dressing-room.