Munster, Leinster and Ulster have announced their teams for this weekend's Champions Cup action.
Robbie Henshaw is back in the Leinster team for Sunday's crucial Champions Cup match against Exeter at Sandy Park.
The Ireland centre has been out of action since suffering a hamstring strain in the build-up to last month's test against Argentina.
He returns to partner Garry Ringrose in the centre for the first time this season.
Johnny Sexton, Sean O'Brien and Rob Kearney are also recalled in a much-changed selection.
Number 8 Jack Conan is one of just four players retained from last week's win at Benetton Treviso.
WATCH: Here is your #LeinsterRugby team to face @ExeterChiefs this Sunday at Sandy Park (KO 5.30pm, live BT Sport). #EXEvLEI #ChampionsCup pic.twitter.com/EFGMSArnrp
— Leinster Rugby (@leinsterrugby) December 8, 2017
Peter O'Mahony, Conor Murray and CJ Stander are back in the Munster team for tomorrow's clash with Leicester at Thomond Park.
Simon Zebo has recovered from a rib issue to retain the number 15 shirt.
Newly capped Irish winger Darren Sweetnam must settle for a place on the bench, as Andrew Conway and Alex Wooton complete the back three.
Team Announcement | Returning internationals and European debuts - we're ready for @thomondstadium on Saturday night. #MunvLEI #SUAFhttps://t.co/AbceMoLb2q pic.twitter.com/4Fh7p0JP0X
— Munster Rugby (@Munsterrugby) December 8, 2017
Rory Best will miss Ulster's game against Harlequins at the Twickenham Stoop on Sunday.
The Ireland captain has been ruled out due to a foot infection.
Iain Henderson and Jacob Stockdale are back from international duty.
💥 TEAM NEWS 💥
— Ulster Rugby (@UlsterRugby) December 8, 2017
Iain Henderson, Jacob Stockdale and Rob Herring will start in Sunday's Champions Cup game v Harlequins.
Henderson will captain the side in the absence of Rory Best, who is ruled out because of a foot infection.
Details ➡️ https://t.co/nn2b7T2Fs4 pic.twitter.com/AYuD7MAqWt