"If we can achieve that feat, to take them out of the race, it will be a good thing," Parra said, knowing victory this weekend would all but end Joe Schmidt's side's hopes of advancing to the quarter-finals.
"After we conceded the losing bonus point at the Stade Marcel Michelin (in 2010), we went to Dublin with good intentions before exploding."
Leinster need a bonus point victory to move to the top of Pool 5 and Clermont flanker Alexandre Lapandry is expecting "hell" from the off at the Aviva.
"We know what is awaiting us. We have been promised hell.
"If we spend our time defending it will be a bad sign," he said.