Roux started playing for Western Province in 2011, and was a member of the side which won the 2012 Vodacom Cup, the team's first ever win in the competition.
He made his Super Rugby debut on 2 June 2012, replacing Eben Etzebeth in the 51st minute of 19–14 win over the Bulls.
Roux started the game against his parent club Leinster on 19 September 2014, as Connacht pulled off an unlikely victory over their Irish rivals.
[12] Roux continued to feature regularly for Connacht, and extended his loan deal for the remainder of the season, taking him to the end of his contract with Leinster.
It was announced in January 2015 that at the end of his contract with Leinster, Roux would join Connacht permanently, with the second row signing a deal to take him up to the summer of 2017.
[13] On 14 June 2021, it was confirmed that Roux left Ireland to join French giants Toulon in the Top 14 competition ahead of the 2021-22 season.