Two English men, in their 20s, were attacked shortly after midnight.
The attack took place in Via Cavour near the Colosseum
The men suffered stab wounds before their wallets and documents were stolen, Italian police have said.
It happened
after the match ended and far away from the stadium area, I think its a robbery not by hatred because the victims are a Brighton fan.
Im sure the police will catch all of them soon, there must be many of CCTV around that area.
Edit: BBC provide a better information, "Brighton & Hove Albion fans stabbed before Europa match in Rome" here is the link
https://www.bbc.com/news/uk-england-sussex-68501921 Brighton fan Joey Thorpe told BBC Radio Sussex: "We were walking home from a bar and being casual, no chanting and in normal clothes. We just got jumped from behind by about six guys all in balaclavas, all wearing black and hiding their faces."
There is no indication whether the attackers were Roma supporters.