Two Italians thought to be fans of the AS Roma football team have been charged with attempted murder after a group of Tottenham fans was attacked in Rome.
Ten Spurs fans, in town for a match with rival Rome club Lazio, were taken to hospital after Thursday's attack.
One Spurs fan injured in the bar attack - named on social media as Ashley Mills, 25, from Brentwood, Essex - will remain in hospital for a fortnight.
Media suspicion initially fell on Lazio fans, but this was later questioned.
The BBC understands Mr Mills has "skull and thigh" injuries from the stabbing in a bar early on Thursday.
There has been speculation the attack was carried out by a far right group with anti-Semitic leanings; Tottenham traditionally draw support from north London's Jewish community.
The BBC's Rome correspondent Alan Johnston said: "There are reports that witnesses heard the masked men shouting 'Jews' as they launched their attack. A senator here has said that what happened had racist, anti-Semitic connotations.
"And he's called on the Interior Minister to report on the matter. The mayor of Rome has said that the possibility that anti-Semitism played a part made the attack all the more serious. Meanwhile Israel's ambassador to Italy has indicated that he has no doubt that this was a racist attack."
Italian newspaper reports named the two men who have been charged as 26-year-old Francesco Ianari and Mauro Pinnelli, 27, both said to be AS Roma fans.
On Thursday Lazio chairman Claudio Lotito said: "Lazio fans have nothing to do with what happened last night" and he added that there would be "surprises about the real culprits".
Meanwhile, Tottenham manager Andre Villas-Boas has called for Uefa to investigate alleged anti-semitic chanting during Thursday's Lazio-Tottenham game.
In October, Lazio were fined 40,000 euros (£32,500) following racist chanting at Spurs' White Hart Lane ground.
During a 0-0 draw in London in September, Tottenham trio Jermain Defoe, Aaron Lennon and Andros Townsend were reportedly subjected to monkey chants by Lazio fans