Police will be at the airport to stop troublemakers travelling to Rome
Police are warning Manchester United fans without tickets not to travel to Rome for the Champions League final.
About 30,000 fans are expected in Italy for the match against Barcelona and an estimated 10,000 will not have tickets.
Greater Manchester Police will have "spotters" stationed at Manchester Airport and will have officers at the game to identify potential hooligans.
The Foreign and Commonwealth Office urged fans to stay away from areas where they may be targeted by gangs.
Supporters are advised not to take the Metro to the Piazzale Flaminio or to use one of the Eternal City's bridges, the Ponte Duca D'Aosta.
The Foreign and Commonwealth Office also issued guidance to stay "as far away as possible" from the Campo dei Fiori Square, where there has been trouble in previous years.
Tickets for Wednesday's final have been produced like credit cards, complete with data chips, which have the personal data of the legitimate owners.
They will be scanned at entrances to the stadium arena and again at the turnstiles. The fan will have to then produce photographic identity.
Supt John Graves, of Greater Manchester Police, said: "The vast majority of fans are genuine supporters and we want them to have a good night, cheer on the team and enjoy themselves.
"We are determined to stop known troublemakers from spoiling the enjoyment of genuine fans.
"I hope fans share my hope that everyone who goes to Rome will behave impeccably."
A Manchester Airport spokesman said they were expected about 20,000 extra passengers early next week and will have more staff on duty.
A 0-0 draw with Arsenal on Saturday gave United their 18th league crown, and equalled the record of rivals Liverpool.