Frankfurt fans were flying back to Germany after their Champions League loss to Napoli, Lazio fans to the Netherlands for their Conference League tie with AZ Alkmaar and Roma fans to Spain for their Europa League clash with Real Sociedad.
The Rome police headquarters said that upon the arrival of the Germans at the Roman airport, security prevented the various groups of ultras from coming into contact.
The supporters of the two Roman teams, the police added, "wore dark-coloured clothing to disguise themselves in case of clashes".
Four Napoli fans and three Eintracht Frankfurt fans were arrested on Thursday after Wednesday's mayhem in Naples.
The German fans flouted a travel ban before clashing with locals and the police before their Champions League last 16 return leg.
Six police officers were hurt in the clashes, officials said.
Hundreds of fans fought running battles in the streets, rubbish containers were overturned and three police cars were damaged, one of which was set on fire.
The identification of all Eintracht Frankfurt fans after yesterday's riots in Naples is underway.
Some 470 German ultras were taken from their hotels to police offices.
Around 120 of them were accompanied in the early hours of the night to the police station in Frosinone, between Naples and Rome, and detained while their identification was confirmed.
They were then escorted to Fiumicino airport and left Italy shortly after.
Another 350 ultras are still at the police station in Salerno, yet to be identified.
Naples Prefect Claudio Palomba spoke highly of the police at a press conference.
"I would like to thank the police forces in Naples who worked all day yesterday,” he said.
He also explained why the German fans were allowed to march through the streets.
“It was a procession of unarmed people, if we had stopped the procession and groups of 30-50 people had gone around it would have been more difficult to control them," he said.
Napoli won 3-0 on the night and 5-0 on aggregate to advance to the Champions League quarterfinals for the first time, joining AC Milan and Inter Milan and giving Italy three teams in the quarters for the first time since 2006.
ANSA
