The three-time Heineken Cup champions let a 14-point lead slip in the final quarter, but still topped Pool Two to sneak into Europe’s last eight.

Andy Goode failed with a last-gasp drop-goal attempt that would have sent Wasps through to the knockout phase, allowing Ian Madigan to wipe his brow.

The Leinster centre was relieved that his four missed penalties did not cost the Dubliners safe passage at the Ricoh Arena.

Fergus McFadden and Isaac Boss claimed Leinster’s tries, with Matt Mullan and Nathan Hughes responding in a frenzied last quarter for Wasps.

Wasps edged out Harlequins into second place in Pool Two on points aggregate between the two sides’ meetings.

Dai Young’s side must now wait for the rest of the weekend’s action to see if they progress as a best-placed runner-up, but that looks unlikely.

Dave Kearney’s shoulder injury and Eoin Reddan’s knee knock could prove troublesome for Ireland boss Joe Schmidt however, with the Six Nations opener in Italy just a fortnight away.

Wasps’ start was rendered inauspicious just 24 seconds in, as flanker Johnson upended the airborne Kearney.

The Ireland wing soldiered on for another two minutes, but was withdrawn nursing his left shoulder.

South African Johnson was probably fortunate to receive merely a yellow card for his crude but unintentional challenge.

Leinster however, took full advantage: two penalty line-outs later Rob Kearney sent wing McFadden into the right corner.

Madigan slotted the touchline conversion with ease to set Leinster seven points to the good.

Sean Cronin unwittingly handed Wasps three points from Goode’s opening penalty when fielding a loose pass in an offside position.

Madigan had a straightforward shot at goal in near-immediate response, but dragged his effort wide.

Johnson returned from the sin-bin with Wasps trailing just 7-3, but the hosts still could not settle.

Madigan missed a second penalty shot, then compounded that error by chipping out on the full under no pressure.

The 25-year-old set Leinster back on the front foot with a neat break, but his refusal to oblige a three-man overlap cost his side a try.

Madigan did convert a penalty shortly afterwards to move Leinster 10-3 ahead, but the Dubliners were still ruing an opportunity missed.

Leinster scrum-half Reddan then trudge off with apparent knee trouble, before Wasps prop Cittadini was sin-binned for killing the ball.

Kiwi outside-half Gopperth then assumed the goal-kicking duties to nudge Leinster 13-3 ahead.

Goode responded in kind from the tee with Cronin offside at the ruck, before scrum-half replacement Boss claimed an opportunist’s try for Leinster.

Gopperth thought he had scored after ignoring an overlap, but Television Match Official (TMO) Herve Dubes awarded the score to Boss from an earlier snipe to the line.

Madigan took back the tee to slot the conversion and move Leinster into a 20-6 lead.

And so the scores remained at the break, but Leinster turned around a man light after Kane Douglas’ rustic shoulder charge on Johnson.

Goode inexplicably missed the routine penalty, leaving Leinster in charge at the break.

Tom Varndell thought he had dragged Wasps straight back into the mix by sneaking into the left corner on the restart, only for Nathan Hughes to be penalised for obstruction.

Leinster escaped the sin-bin unscathed as a result, a feat to underline the visitors’ dominance until the hour.

Madigan had the chance to stretch Leinster’s lead, but duly missed his third penalty of an off-kilter afternoon from the tee.

Wasps raised the tempo in a sustained bid for a foothold, but Luke Fitzgerald produced an astute tackle on Varndell that typified the visitors’ stubborn resistance.

Finally Wasps breached that defence just past the hour, Mullan burrowing home after good work from number eight Hughes.

Goode’s conversion cut Leinster’s lead to 20-13 with the final quarter still to unfold.

A loose kick dead from Gopperth gifted Wasps the immediate initiative, and the hosts gleefully accepted with their second try.

Number eight Hughes powered home from a driven lineout to trim Leinster’s lead to two points.

Goode struck the post with the conversion, only to be handed a second chance courtesy of an early Leinster charge.

The former England marksman grabbed the reprieve and levelled the scores, with nine minutes to play.

Gopperth snatched at a drop-goal attempt as Leinster rallied, but stood it up in his haste to strike.

Madigan had the chance to snatch Leinster the lead after Elliot Daly hit a ruck from the side, but dragged his penalty wide for his fourth miss of the day.

Goode lined up the final-play drop-goal effort in a desperate bid to upstage the visitors, only to drag his effort wide and send Leinster through.