Roma midfielder Rodrigo Taddei believes it will require a superhuman effort for his side to turn around their Champions League quarter-final tie with Manchester United.
Roma face a tough task in the return leg at Old Trafford on Wednesday after slipping to a 2-0 defeat in the first match at the Stadio Olimpico last week.
Sir Alex Ferguson's side are the overwhelming favourites ahead of the decider, but Taddei insists progressing to the last four is the only option for Luciano Spalletti's players.
'Those of us who have come to Manchester have to be focused and try to give not 100% but 200% in order for us to progress, something which is our aim,' said Taddei.
'We are aware of how difficult our task will be. We have a negative result against us and we face a great side away from home.'
Roma will travel to Manchester without talismanic forward Francesco Totti, who has failed to recover from a thigh injury that also ruled him out of the first leg.
Totti's season has been marred by injuries - the playmaker has missed 13 games in total - and Taddei revealed the rest of the team are becoming accustomed to playing without their top scorer.
'Totti is a top player and this cannot be denied,' said Taddei.
'But we have had to play without him already this campaign and we have taken important results.'
Taddei, who scored the opener in Roma's 3-2 league win against Genoa on Saturday, is confident his team can succeed without the former Italy international.
'It is understandable that others may find in Totti's absence an excuse for defeat,' he said.
'But we know that the defeat against Manchester United in the opening leg came from the fact we didn't make use of our chances to score.'
Roma will also be without defender Matteo Ferrari, who underwent knee surgery earlier this month.