Two Roma fans have reportedly been arrested in the Italian capital ahead of the side's showdown with Chelsea in the Champions League tonight.

According to The Sun, the two fans were arrested following a "violent" attack on Blues supporters as they enjoyed drinks at The Shamrock pub.

"It all kicked off around midnight just as the pub was about to close up," a witness told the newspaper. "It's popular with visiting fans as it has a football theme and is in the centre of town close to the Colosseum.

"This group of Roma fans burst in wearing masks and sticks and attacked the Chelsea fans who were heavily outnumbered.

"It was chaos for a few minutes and then when police arrived the Roma fans ran off but they stopped two of them."

Around 2,000 Chelsea fans are thought to be in Rome for the Group C encounter, which has been branded "high risk" for fan trouble by police in both countries.