Ulster Rugby have suffered a set back after Jean Deysel was withdrawn from their side to face Scarlets on Friday after sustaining a minor eye trauma during training.
His injury has resulted in Matty Rea starting at blindside, with Chris Henry moving to the opposite side of the scrum and Sean Reidy shifting to eight.
Clive Ross will take Rea's spot on the replacements bench.
Ulster (revised): 15 Louis Ludik, 14 Andrew Trimble, 13 Luke Marshall, 12 Stuart McCloskey, 11 Jacob Stockdale, 10 Christian Lealiifano, 9 John Cooney, 8 Sean Reidy, 7 Chris Henry (c), 6 Matty Rea, 5 Alan O'Connor, 4 Kieran Treadwell, 3 Wiehahn Herbst, 2 Rob Herring, 1 Kyle McCall
Replacements: 16 John Andrew, 17 Andrew Warwick, 18 Rodney Ah You, 19 Robbie Diack, 20 Clive Ross, 21 Paul Marshall, 22 Peter Nelson, 23 Tommy Bowe