Roma sporting director Monchi claimed that VAR "must" be brought into the Champions League after "incredible" errors by the officials during his side's semi-final loss to Liverpool.
Eusebio Di Francesco's Italian outfit threatened a repeat of their quarter-final comeback against Barcelona, but fell to a 7-6 aggregate defeat despite a 4-2 second-leg win at the Stadio Olimpico.
Although Roma were awarded a penalty in each game of the last-four tie, Monchi insisted his team would have reached the final if VAR had been used.
"Congratulations to Liverpool but it is necessary to analyse what happened," he told Italian television.
"There were two very clear penalties that were missed tonight and that changed everything, and in the first leg they scored an offside goal.
"The VAR must come into the Champions League. I don't understand why there is no VAR in the most important competition."