Johnny Sexton is set to make his injury comeback for Leinster on Sunday, after being named on the bench for their Heineken Champions Cup meeting with Montpellier at the RDS (KO 1pm).
The Ireland captain hasn't featured since injuring his knee and ankle in November's win against the All Blacks.
And the out-half will supplement Ross Byrne this Sunday, with Byrne getting the starting 10 shirt to join Jamison Gibson-Park in the half-backs.
Leo Cullen's side are close to full-strength for their first game in five weeks, although Robbie Henshaw is not included.
It's a first choice front row of Andrew Porter, Tadhg Furlong and Ronan Kelleher, with James Ryan captaining the side from second row where he partners Ross Molony.
The backrow sees Caelan Doris and Josh van der Flier pack down either side of number eight Jack Conan, with Leinster picking seven of the eight forwards that started Ireland's win against the All Blacks two months ago.
With Henshaw not included, Garry Ringrose is partnered in the centre by Ciaran Frawley, while James Lowe drops to the bench with Jimmy O'Brien given a start on the left wing.
Jordan Larmour starts on the right wing, with Hugo Keenan named at full-back.
Among the replacements is Rhys Ruddock, who is set to make his 50th appearance in this competition.
Leinster: Hugo Keenan; Jordan Larmour, Garry Ringrose, Ciaran Frawley, Jimmy O'Brien; Ross Byrne, Jamison Gibson-Park; Andrew Porter, Ronan Kelleher, Tadhg Furlong; Ross Molony, James Ryan (capt); Caelan Doris, Josh van der Flier, Jack Conan
Replacements: Dan Sheehan, Ed Byrne, Michael Ala'alatoa, Rhys Ruddock, Max Deegan, Luke McGrath, Johnny Sexton, James Lowe
Connacht have made three changes to their team to take on Leicester Tigers at the Sportsground on Saturday (KO 3:15pm).
Two of those changes come in the tight five where Shane Delahunt starts at hooker and Niall Murray comes into the second row. Props Matthew Burke and Finlay Bealham and lock Oisín Dowling retain their places.
The back row as well as the half-back and centre pairings are all unchanged. Jarrad Butler is at number eight with flankers Cian Prendergast and Conor Oliver alongside him, while Jack Carty captains the side beside scrum-half Kieran Marmion.
Bundee Aki and Sammy Arnold start at 12 and 13 respectively.
The third change is in the back three where Connacht's all-time record try scorer Matt Healy comes in for his first appearance of the season in place of the injured Mack Hansen, starting on the wing with John Porch on the opposite wing and Tiernan O’Halloran at full-back.
Connacht: Tiernan O’Halloran; John Porch, Sammy Arnold, Bundee Aki , Matt Healy; Jack Carty (capt), Kieran Marmion; Matthew Burke, Shane Delahunt, Finlay Bealham; Oisín Dowling, Niall Murray; Cian Prendergast, Conor Oliver, Jarrad Butler
Replacements: Dave Heffernan, Tietie Tuimauga, Jack Aungier, Ultan Dillane, Paul Boyle, Caolin Blade, Conor Fitzgerald, Tom Farrell
Ulster's James Hume has been passed fit to take his place in the starting line-up for his side's trip to Franklin's Gardens to face Northampton on Sunday(KO 3:15pm).
Hume suffered a hamstring injury scare against Munster last week but has shaken of the niggle.
Also fit is Robert Baloucoune who has recovered from a shoulder injury which forced him to miss Ulster’s home clash with the Saints in December. Baloucoune is named on the right wing with Mike Lowry and Ethan McIlroy taking up the full-back and left wing starting positions.
Stewart Moore comes in to partner Hume in the centre, while Billy Burns has been selected at out-half with Nathan Doak, who is set to make his first European start, joining him at scrum-half, replacing the injured John Cooney.
Andrew Warwick and Marty Moore will pack down either side of Rob Herring in the front row.
Alan O’Connor captains the side in the absence of Iain Henderson, and joining him in the second row is Kieran Treadwell. Marcus Rea will start at blindside flanker, with Nick Timoney named at openside and Duane Vermeulen at number eight.
Ulster: Mike Lowry; Robert Baloucoune, James Hume, Stewart Moore, Ethan McIlroy; Billy Burns, Nathan Doak; Andrew Warwick, Rob Herring, Marty Moore; Alan O’Connor (capt), Kieran Treadwell; Marcus Rea, Nick Timoney, Duane Vermeulen.
Replacements: John Andrew, Eric O’Sullivan, Tom O’Toole, Sam Carter, Greg Jones, David Shanahan, Ian Madigan, Ben Moxham.
Follow Castres v Munster (Friday, 8pm), Connacht v Leicester (Saturday, 3.15pm), Leinster v Montpellier (Sunday, 1pm) and Northampton v Ulster (Sunday, 3.15pm) via our live blogs on rte.ie/sport or on the RTÉ News App, or listen to live radio coverage of Castres v Munster and Connacht v Leicester on RTÉ Radio 1 Extra and RTÉ Radio 1.