Tony Ward believes Leinster put in their best performance of the season to date in beating Castres at the weekend to set-up a winner-takes-all showdown with Wasps.
Both these sides warmed up for the Pool 2 decider at Coventry's Ricoh Arena next Saturday lunchtime with contrasting successes.
Matt O'Connor's side ran riot on the struggling Top 14 side while Wasps staged a smash-and-grab victory over Harlequins at the Stoop. Their tackle count fell one short of 200, a clear indicator of their defensive efforts.
The three-time European champions have been criticised in many quarters for some below-par performances this season, but are just one victory away from the last eight of the inaugural Champions Cup, with a home tie the dangling carrot.
Ward says that the seven-try showing will boost morale ahead of the pool finale.
"Leaving the RDS on Saturday I was very confident," he told Radio One's Morning Ireland programme.
"It was one of the most complete performances I have seen in a long time."
However he said he is cautious after viewing the 23-3 defeat of Conor O'Shea's Harlequins.
"I saw what Wasps did to Harlequins and I was really impressed. It's going to be a winner takes all and it will be very difficult for Leinster."
"It really is some competition."