The holders knew defeat at the Ricoh Arena would open the door for Toulouse to snatch first place in the group and a more favourable last-eight meeting.
But those fears were essentially calmed by half-time as Leinster took a 20-0 lead into the interval thanks to tries from Garry Ringrose, who powered across the line underneath the posts, and hooker Cronin, who benefitted from his pack’s stellar work at a rolling maul.
Nathan Hughes, whom it was announced earlier this week would leave Wasps for Bristol Bears at the end of the season, got the hosts on the board in the second period but another driving maul saw Cronin double his tally.
Dan Robson pulled Wasps back to within two scores shortly after the hour but Leinster showed their class and a fine move through the hands released Noel Reid to secure the bonus point – Marcus Watson’s late score for the home side proving immaterial.
— Heineken Champions Cup (@ChampionsCup) January 20, 2019
Victory sees Leinster qualify as the third seed while Toulouse, who won 20-17 at home to Bath, advance as the seventh-ranked side and face a trip to Top 14 rivals Racing 92.
Toulouse were in command at the break, leading 17-3 courtesy of scores from Joe Tekori and Antoine Dupont.
Champions Cup quarter-finals:
The qualifiers for the 2018/19 Heineken Champions Cup quarter-finals and their rankings at the conclusion of the pool stage are as follows:
1 Saracens (winner Pool 3 – 28 points)
2 Racing 92 (winner Pool 4 – 26 points)
3 Leinster Rugby (winner Pool 1 – 25 points)
4 Edinburgh Rugby (winner Pool 5 – 23 points)
5 Munster Rugby (winner Pool 2 – 21 points)
6 Ulster Rugby (best pool runner-up – 22 points)
7 Toulouse (second best pool runner-up – 21 points)
8 Glasgow Warriors (third best pool runner-up – 19 points)
The quarter-final matches to be played on 29/30/31 March are as follows:
QF 1: Saracens v Glasgow Warriors, Allianz Park
QF 2: Edinburgh Rugby v Munster Rugby, BT Murrayfield
QF 3: Leinster Rugby v Ulster Rugby, Aviva Stadium
QF 4: Racing 92 v Toulouse, Paris La Défense Arena
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