Ulster
Ulster face a tough trip to Leicester Tigers in round 6 of their Heineken Cup pool with a home quarter-final on the line.
Craig Gilroy has recovered from the injury that he sustained against Montpellier and starts on the left wing with Andrew Trimble named on the right and Jared Payne continuing at fullback.
Prop Callum Black makes his first ever start in the Heineken Cup.
Roger Wilson is selected at blindside with Robbie Diack moving to the bench.
Nick Williams starts at Number 8 with Chris Henry picked at openside.
Rory Best makes his 150th appearance for Ulster in tomorrow's match.
A win for Ulster will guarantee a home quarter-final.
Munster
Peter O'Mahony ©INPHO/James Crombie
Dave Foley continues in the second row for Munster ahead of Sunday's clash with Edinburgh while Simon Zebo remains on the bench as he continues his comeback from injury.
Prop BJ Botha is also on the bench and is replaced by Stephen Archer in the front row.
Munster: Felix Jones; Keith Earls, Casey Laulala, James Downey, Johne Murphy; Ian Keatley, Conor Murray; Dave Kilcoyne, Damien Varley, Stephen Archer; Dave Foley, Paul O'Connell; Peter O'Mahony Capt., Tommy O'Donnell, James Coughlan. Replacements: Duncan Casey, James Cronin, BJ Botha, Donncha O'Callaghan, Paddy Butler, Duncan Williams, JJ Hanrahan, Simon Zebo.
Leinster
Tonight Leinster host Ospreys at the RDS needing at the very least a losing bonus point to secure a quarter-final spot.
Ahead of that game it has been reported that Jamie Heaslip's future remains uncertain. But he starts at No 8, while Jimmy Gopperth is favoured at fly-half ahead of Ian Madigan.
Find the full team, which also features a welcome return for Richard Strauss, by clicking here.
Connacht
Jason Harris-Wright, Gavin Duffy and head coach Pat Lam ©INPHO/James Crombie
Gavin Duffy and Dan Parks have returned to the Connacht starting XV for tomorrow's clash with Saracens at Allianz Park in Barnet.
Second row Craig Clarke also returns while John Muldoon moves to number 8 in place of the injured Eoin McKeon.
Andrew Brown slots into blindside flanker while Jake Heenan remains on the openside.
Eoin McKeown is out through injury.
Main image: Andrew Trimble laughing at something ©INPHO/Presseye/Brian Little
