Ulster have made five changes to their line-up for the visit of Glasgow Warriors in the Heineken Cup on Friday.
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Ulster are on the verge of securing their place in the quarter-final stages having picked up 15 points from their four games so far.
However having lost to Northampton last time out, they know that they can't afford any more slip up - with both Castres and the Saints chasing hard.
Ulster boss Mark Anscombe has named Jared Payne and Paddy Wallace in his back division for the clash, while Rory Best, John Afoa and Iain Henderson start in the pack.
Glasgow head coach Gregor Townsend has made six changes from the side which defeated Benetton Treviso in the RaboDirect PRO12.
Duncan Weir comes in to partner Henry Pyrgos at half-back while Peter Horne returns to the side at inside centre.
Alex Dunbar keeps his spot at outside-centre with Peter Murchie taking up the full-back slot.
Sean Maitland returns in place of Tommy Seymour with DTH van der Merwe on the opposite wing.
Tom Ryder starts alongside Al Kellock in the second row and James Eddie will start in the back row after Ryan Wilson suffered a shoulder injury in the win over Treviso.
Warriors will have a squad of just 22 due to a number of propping options being unavailable for the game.
Ofa Fainga'anuku, Mike Cusack and George Hunter are all injured, while Jon Welsh and Ed Kalman have not been available since the summer and were not included in the Heineken Cup squad, leaving Gordon Reid the only other fit and eligible prop available.
Following extensive discussions between the club and the competition organisers, the ERC confirmed that tournament rules would not allow another front row to be added to the list of eligible players.
Ulster: 15 Jared Payne, 14 Andrew Trimble, 13 Darren Cave, 12 Paddy Wallace, 11 Craig Gilroy, 10 Paddy Jackson, 9 Ruan Pienaar, 8 Nick Williams, 7 Chris Henry (c), 6 Robbie Diack, 5 Iain Henderson, 4 Louis Stevenson, 3 John Afoa, 2 Rory Best, 1 Tom Court.
Replacements: 16 Rob Herring, 17 Calum Black, 18 Declan Fitzpatrick, 19 Neil McComb, 20 Roger Wilson, 21 Paul Marshall, 22 Michael Allen, 23 Chris Cochrane.
Glasgow: 15 Peter Murchie, 14 Sean Maitland, 13 Alex Dunbar, 12 Peter Horne, 11 DTH van der Merwe, 10 Duncan Weir, 9 Henry Pyrgos, 8 Josh Strauss, 7 Robert Harley, 6 James Eddie, 5 Al Kellock (c), 4 Tom Ryder, 3 Moray Low, 2 Doug Hall, 1 Ryan Grant.
Replacements: 16 Pat MacArthur, 17 Gordon Reid, 18 tbc, 19 Nick Campbell, 20 Tim Swinson, 21 Nikola Matawalu, 22 Scott Wight, 23 Stuart Hogg.