Italian World Cup winner Francesco Totti has no doubt Cristiano Ronaldo will be the man Roma must stop if they are to dump Manchester United out of the Champions League tonight.
The Serie A outfit arrive at Old Trafford looking to preserve their 2-1 first-leg lead and book a semi-final meeting with either AC Milan or Bayern Munich.
Although it is their longest run in the competition since they reached the final in 1984, Roma could be regarded as slight favourites to advance given the large number of absentees from the United squad.
However, even without the likes of Louis Saha, Paul Scholes and Nemanja Vidic, Totti recognises United remain a formidable force on home soil. And in Ronaldo, hailed the best player in the world by Wayne Rooney, they have a man who could derail Roma's European dream by himself.
'Ronaldo can decide a match on his own,' observed Totti.
'You see what he can do, not just against us last week, but regularly in the Premiership, and it seems he is capable of doing just about anything.
'He can make the difference in this game but we just have to hope he doesn't play well.'
As a lifelong Roma fan, Totti believes the club's first trip to the Theatre of Dreams represents a more important challenge than the World Cup Final itself.
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Yet, as the 30-year-old is acutely aware, the contest takes place amid the fear of reprisals and possible attacks on the Italians' 3,800-strong support as revenge for the trouble that erupted inside and outside the Stadio Olimpico last week.
Sir Alex Ferguson has attempted to play down such fears, insisting the Roma fans will be safe during their stay in England.
And Totti has urged any visiting supporters thinking of causing trouble not to.
'I want our fans to be happy and for them to enjoy the experience of being here,' said Totti.
'Being a football fan is about supporting your team and I would appeal to ours to just enjoy the performance we intend to put on for them.'
There have been reports some of Roma's notorious 'Ultras' will be at tomorrow's game, increasing the possibility of the violent scenes that scarred the first meeting.
However, Roma coach Luciano Spalletti backed up Totti's words.
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'Our fans must behave,' he said.
'They are part of the growth spurt we are enjoying as a club and if they appreciate what we are doing, good behaviour will come spontaneously.'