Ahead the 2014–15 season, it was announced Roux was joining Connacht, another Irish province, on a loan deal to last until 31 December 2014. The move to Connacht saw him reunited with his former Western Province teammate Danie Poolman. Roux made his Connacht debut on 6 September 2014, when he started against Newport Gwent Dragons in the first game of the 2014–15 Pro12, and played the full 80 minutes in a Connacht victory. Roux started the game against his parent club Leinster on 19 September 2014, as Connacht pulled off an unlikely victory over their Irish rivals.