Andre Villas-Boas has urged UEFA to take action against Lazio if their fans are found guilty of chanting anti-Semitic songs at Tottenham during Thursday night's Europa League draw at the Stadio Olimpico.
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The home supporters chanted "Juden Tottenham" during the first half of the goalless draw, which came the day after fans of the London club were attacked in a vicious scuffle in a city centre pub.
UEFA fined Lazio £32,500 for their fans monkey chanting at three Spurs players during the reverse fixture in September, and Villas-Boas hopes the organisation move swiftly to establish the facts.
"It will take another investigation," the Tottenham manager told a press conference.
"It happened last time and it was acted upon quickly by UEFA. We will have to wait and see if there is anything to act upon. If there is UEFA have to act."
UEFA are expected to decide whether to launch an investigation tomorrow when they receive the match delegate's report.
Thursday night's game had already been overshadowed before kick-off by the shocking and brutal attack on a group of the club's supporters early this morning.
Around 20 men burst in to the Drunken Sailor pub in Campo dei Fiori at around 1am and beat the fans with sticks and glass bottles. One fan is recovering in hospital after being stabbed in the head and leg.
Villas-Boas expressed his disappointment at the attack on Thursday night, saying: "It is an extremely difficult moment for them.
"We have to be aware there is a police investigation and I'm not in control of all facts.
"But there is massive disappointment and the fear they've gone through is hard.
"To point a finger at this point would be incorrect but (we) give them a message of support.
"As a club, we will try to help them overcome this."
Paul Gascoigne joined the two teams in the stadium for a lap of honour before the game, but the former England star will have been disappointed with the level of play between two of his former clubs.
Tottenham should have taken an early lead when Gareth Bale latched on to Tom Carroll's pass and beat Claudio Marchetti, but the Welshman's shot was wrongly ruled out for offside.
Spurs were on the back foot for most of the rest of the game and only escaped with a point thanks to Hugo Lloris' heroics.
The Frenchman, who kept his place instead of Brad Friedel, saved well three times from Libor Kozak.
"It was important for him and he was a great help for the team," Villas-Boas added.
"He was decisive in a couple of moments."
The result means Spurs only have to draw their final game against Panathinaikos next month to make the knockout stages of the competition.
Yet Villas-Boas was disappointed that his team had not qualified tonight thanks to the linesman's incorrect call over Bale's goal - especially after seeing his team denied three goals in the reverse fixture, which also ended 0-0.
"Against Lazio we've had four goals disallowed. Two of them rightly and two of them not, maybe three," Villas-Boas said.
"It's difficult to see decisions go that way but we move on. We take the result. We are in a comfortable position to qualify."
The draw puts Lazio through, but manager Vladimir Petkovic was also disappointed to not win the game.
"It was a very good performance," he said.
"We played a top team from one of best leagues in the world but we managed to put pressure on them. We deserved three points and I must compliment my players."