Francesco Totti, the revered former captain and symbol of Roma, warned fans to behave and urged calm before Wednesday’s Champions League semi-final with Liverpool, as the city braced itself for possible outbreaks of violence.

From a ban on alcohol around Stadio Olimpico that took effect on Tuesday night to plans to open the stadium early on Wednesday for Liverpool fans, Roman officials have sought to put measures in place to prevent the kind of violence that erupted in Liverpool last week for the first leg of the semi-final.

Sean Cox, a Liverpool fan from Ireland, remains in critical condition with serious head injuries after allegedly being attacked last Tuesday night by two Italians outside Anfield.

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The attack put the spotlight on Roma’s violent ultras, who were seen attacking Liverpool fans while wearing balaclavas and face scarves, swinging ropes and bats as they sang songs insulting their opponents. The ultra fans have been called “fucking idiots and assholes” by James Pallotta, the Roma president, but the violence last week has highlighted the militant fans are not just troublemakers. They pose a serious risk.

About 5,000 British fans were expected to arrive in the Eternal City from Tuesday, and Italian police have been holding meetings with Uefa, their British counterparts, and officials from both teams to discuss security measures.

While most Liverpool fans will be arriving at Rome’s Fiumicino and Ciampino airports, authorities across Italy have been told to be on alert for possible skirmishes with fans coming in from other surrounding airports.

Liverpool fans have been instructed to meet at Piazza delle Canestre on Wednesday, inside the Villa Borghese park, from where they will be bussed to the stadium. Liverpool fans who are travelling on their own have been urged to use the stadium’s Ponte Milvio entrance, while Roma fans will be ushered into the stadium’s southern entrance.

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Uefa’s Kenny Scott, the director of safety, has urged authorities to ensure that British fans are not left too long in either the stadium or the Piazza delle Canestre meeting point, according to Corriere dello Sport.

Liverpool fans will also be urged to confine their tourism to two spots in the city where there will be a heightened police presence: Campo di Fiori, and Largo Corrado Ricci, near the Roman forum.

About 2,000 police officers will be on patrol in connection with the match. The Italian authorities have also been warned about 30-40 “risky” Liverpool fans who were considered to pose a security threat but had not been barred from attending the match, according to La Repubblica.

Totti, who retired last year, said in a statement to fans on Monday all eyes were now on Rome. “The world looks at us and we want to dress Rome with its best suit: we are its ambassadors, we have a great responsibility, inside and outside the Olimpico Stadium,” he said.

Facebook Twitter Pinterest Francesco Totti, who has now retired, is revered by Roma’s supporters. Photograph: Robbie Jay Barratt - AMA/Getty Images

The question now is whether Totti will influence the Roman ultras.

Pallotta, an American, called last weekend for Italians to come together to denounce extreme fans that have damaged the reputations of all major Italian teams.

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“It’s not just an issue for Rome. It’s an issue for Italy and it’s an issue for the authorities and it’s an issue for all of us to band together and to finally wake up so that we don’t have a reputation - that’s not deserved around the rest of the world - that our fans are not good fans,” he said.

There has been one incident of deadly football-related violence in Rome in the last few years. In 2014, a Napoli fan was shot dead during a clash with a Roma fans before the Italian Cup final. Ciro Esposito, 29, was killed before the match at Stadio Olimpico. Police said the shooting occurred after the Roma fan insulted the Napoli fans. When they responded to the jeers, he shot them, killing Esposito.

The Rome police chief, Giampietro Lionetti, said this week: “There is a lot of history between the two sets of fans and it will be our job to keep them all safe.”