Daniele De Rossi felt Roma had a "blackout" against Liverpool at Anfield and were punished by their opponents' persistent long balls forward.
Eusebio Di Francesco's side lost 5-2 in the first leg of their semi-final tie, meaning they must replicate their 3-0 win over Barcelona in the quarter-final second leg if they are to progress to the final.
Liverpool were 5-0 up with 68 minutes played, with Mohamed Salah and Roberto Firmino scoring twice and Sadio Mane also on the scoresheet, as the visitors failed to deal with the Reds' quick-fire passes to the front three.
However, late goals from Edin Dzeko and Diego Perotti gave the visitors some hope ahead of the return fixture in the Italian capital, and De Rossi is refusing to give up.