Police also appealed for people to hand over any photos or video of the fighting, which left 14 England football fans in hospital .
A group of 150 “hyper rapid, hyper violent” Russian hooligans attacked Three Lions supporters in the French port city, throwing chairs and beer bottles in violent scenes the National Police Chiefs’ Council (NPCC) said were “on a scale we haven’t seen for many years”.
Two England fans are still in hospital with serious injuries, including Andrew Bache, 51, from Portsmouth and Stewart Gray, 47, from Leicester, who was found injured near the Rue Forte Notre Dame area at 4pm.
Police said Mr Gray, who recently opened his eyes after being in a coma, was wearing a blue t-shirt and was part of a group of fans who had gathered in the city centre at around 2.30pm. Officers have no footage to show how he came to be injured.
Detective Superintendent Andy Barnes, who is leading the UKFPU investigation, said: “Please come forward if you have any information, photos or video of what happened in Marseille.
“We particularly need footage to help us understand how Stewart Gray became so badly injured. We are aware that there were people in the apartment above the incident who we would like to speak to as witnesses.
“They were seen to be taking video footage and this could be crucial evidence. If you recognise yourself or someone you know in this footage, then please get in touch.”
Mr Bache, 51, suffered a cardiac arrest, extensive brain injuries and a lung infection after being set upon by Russians armed with iron bars.
Meanwhile, six England fans appeared in a French court just days later and were given sentences of between one and three months for their part in the fighting.
The NPCC warned any England supporters found to have been involved in the disorder could face football banning orders in the UK.
Assistant Chief Constable Mark Roberts, National Police Chiefs’ Council lead for football policing, said: ” The violence in Marseilles was highly organised and those involved appeared determined to carry out sustained attacks at a level of aggression I have not encountered in the past 10 years.
“We are very aware that this involved a small minority of English supporters. Investigations will continue and these fans could be subject to a football banning order on their return to the UK.
“Our investigation team is on hand to assist the French police in any way that we can to ensure those involved are identified and prevented from engaging in further disorder.”
The appeal came after a “miracle” night in Lille for Ireland that saw the Republic join England, Wales and Northern Ireland in the Euro 2016 knockout stages.
Martin O’Neill’s squad will now hope to keep fans’ dreams alive when they meet hosts France in Lyon on Sunday.
Paris will be the backdrop to a home nations face-off on Saturday, when Northern Ireland face a Welsh team hot off their 3-0 thrashing of Russia.
Then on Monday it is to the French Riviera for England and Iceland, where Roy Hodgson’s men will hope to find the “je ne sais quoi” that eluded them in their 0-0 draw against Slovakia.
A man has been given a five-year football banning order at Uxbridge Magistrates’ Court after being photographed appearing to throw a missile during the fighting in Marseille.
Joe Pizarro, 34, of Clayton Street, Kennington, was identified by Met Football Intelligence Officers from footage taken by French police during disorder on June 10.
Detective Superintendent Andy Barnes from the Met’s Public Order Branch said: “The vast majority of travelling British fans are well behaved and in France to enjoy the tournament. Sadly a small minority have engaged in disorder. This will not be tolerated.
“By acting quickly we have prevented this man from travelling back to France to cause more trouble. What’s more, he will not be able to cause trouble at games in the UK either.”