Leinster cruised to a 37-10 victory against Wasps to finish top of Pool 1 and progress to the European Champions Cup quarter-finals, while Toulouse also won on Sunday.
Leinster followed the Saturday lead of Munster and Ulster, and Connacht in the Challenge Cup, by finishing their pool stage with a victory, en route to the quarter-finals.
Shields was ruled out by a side strain, and Launchbury - although he passed a head injury assessment - did not rejoin the action following a knock.
Saracens fly-half Farrell has had surgery to fix ligament damage to a thumb and is expected to return in seven to ten days, a time frame that would enable him to play against opening Six Nations opponents Ireland in Dublin on February 2.
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The visitors had the momentum when Ross Bryne kicked a 13th minute penalty goal and soon Garry Ringrose breached the defence of Leinster in the 17th minute.
Wasps got over twice in the second half, Nathan Huges with the first, with Dan Robson going over for the second. We don't see it potentially being an issue moving forward.
They added a second try five minutes before half-time when Cronin emerged with the ball from under a pile of bodies after Leinster's forwards drove a close-range lineout, with another Byrne conversion taking Leinster 20 points clear by the interval.