Romelu Lukaku strikes Manchester City Coach Mikel Arteta with a bottle during post match fracas at Old Trafford

Mikel Arteta was pictured covering his cut face after being left with blood streaming from a cut suffered in the Manchester derby tunnel brawl.

Manchester City‘s coach suffered a cut head on Sunday after having a bottle thrown at him by a Manchester United player, believed to be Romelu Lukaku.

Arteta was back at the Manchester City training ground this morning with the rest of Pep Guardiola’s players, including goalkeeper Ederson who was at the centre of a row with United boss Jose Mourinho that sparked a 20-man bust-up.

Arteta was sitting in the driver’s seat of a Chevrolet alongside fellow coach Lorenzo Buenaventura, with the Spaniard clearly determined to cover his face.

He lifted a hand above his eyes where the bottle struck him after the bad blood between the fierce rivals became real.

Spanish radio station Cadena SER have claimed that Arteta’s injury was caused by a bottle thrown by United striker Romelu Lukaku.

Ederson pulled up to training in his 458 Italia red Ferrari and was in the thick of the scrap after full time at Old Trafford hours earlier.

The Brazilian engaged in a heated confrontation with Mourinho after the United boss objected to City’s celebrations which he deemed disrespectful and over-zealous.

Mourinho demanded City players show ‘more respect’ as music blared out of their dressing room following their 2-1 victory.

The United manager and Ederson yelled at one another in Portuguese and the altercation escalated into a huge confrontation with players and staff piling in.

Mourinho had water squirted at him, was doused in milk and was hit on the head by an empty plastic bottle, which the home players believe was thrown by the opposition goalkeeper.

Witnesses said some players tried to swing punches while police looked on in disbelief.

City feel Mourinho overstepped the boundaries by entering their dressing room.

Eyewitnesses were staggered at the eruption that followed the final whistle. United believed City had celebrated too much following their 2-1 win and showed a ‘lack of respect’.

The Football Association can ask for CCTV footage of the melee and are not bound by Michael Oliver’s official report if they seek to take action against either club.

United had refused Amazon Prime documentary makers access to the tunnel area at Old Trafford.

The crew are following City throughout the season for a fly-on-the-wall style documentary and would have captured the melee had they been granted access.

The FA has sought observations from both clubs in relation to the incident and they have until Wednesday to respond.

The match referee did not witness anything, therefore, no report was received on the matter.

CCTV shots of the scene can be requested from United after Mourinho walked into the boisterous City dressing room to demand ‘more respect’.

It might not have been Pizzagate from 2004, when United and Arsenal players scrapped and Sir Alex Ferguson was hit on the head by a slice thrown by Cesc Fabregas — but it wasn’t far off.

The United boss was heading from his own players’ dressing room to do his post-match press conference when he walked into City’s domain to make his feelings known and was confronted by City goalkeeper Ederson.

United’s players were enraged by the perceived gloating of City players and followed Mourinho into the corridor area between the dressing rooms, sparked the skirmishes between players.

City, for their part, believed Mourinho, sore at losing, had overstepped the boundaries by entering their dressing room to voice his discontent.

Old Trafford security staff were forced to disperse the rumpus as United players blamed their City counterparts for ‘rubbing their noses in defeat’ by ‘whooping and cheering’. When tempers cooled, police remained outside the dressing rooms.

Mourinho’s anger was also fired by what he claimed was City receiving preferential treatment by referees, while he branded his own side’s defending ‘disgraceful’.

In comments which irked City boss Guardiola, Mourinho insisted the league leaders were fortunate to seal a record 14th consecutive win — stretching their lead in the table to 11 points.

Mourinho was adamant Oliver’s refusal to award a 79th-minute penalty after Ander Herrera went down under Nicolas Otamendi’s challenge was wrong. Herrera was booked for diving.

‘They are lucky, I think they have all these decisions in their favour,’ said Mourinho, who had accused City of being divers in the run-up to the game.

‘We can speak about anything you want, we can bring any football theory, stats, ball possession, but like last season it is a huge penalty in a crucial moment.

‘You expect City to score great goals, not to score two disgraceful goals. They had apparent control but the biggest save is the double save of Ederson.’

But Guardiola recalled similar jibes after last year’s 2-1 win here. ‘It was the same,’ he sighed. ‘But we won because we were better. In all departments we were better. I don’t know the plan from my opponent but we came here to try to win.

‘We did the same at Stamford Bridge. I am happy because so many people say you cannot win in England playing like this. It’s still only December. If we have an 11-point lead when we play the derby in April then maybe I will tell you we have the title.’

United could also face action after a flare landed near City midfielder Bernardo Silva during the second half.