Chelsea skipper John Terry has appealed to the club's fans to be on their best behaviour in Rome.
The Blues take on Roma in their Group A Champions League tie on Tuesday night and Terry wants their 3600 travelling fans to stay out of trouble.
A series of security measures have already been put in place to ensure there are no clashes between the two sets of supporters and Terry said: "I want everyone travelling to be careful and sensible. Enjoy the city and the game. Let's all get home safe and with a good result."
Two years ago, three Middlesbrough fans were stabbed while in April last year, 11 Manchester United supporters were hospitalised due to incidents before their semi-final first leg.
Last December, seven United supporters were taken to hospital after the two sides met again in the group phase but their quarter-final this April passed without problems.
The Champions League final is being staged in Rome this season but UEFA president Michel Platini has already warned it could be moved if there is any more serious violence involving Roma's fans.
Chelsea, who beat the Italian side 1-0 at Stamford Bridge a fortnight ago, smashed Sunderland 5-0 on Saturday in the Barclays Premier League.
Nicolas Anelka notched a hat-trick and paid tribute to new Chelsea coach Luiz Felipe Scolari for helping him put the fire back into his game.
"The manager said he wanted to see more fire from me this season," explained Anelka. "He has put me on the pitch and it's working.
"The more you play, the stronger your game becomes and you can be confident."
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