Ntubeni debuted for both Western Province and the Stormers in 2011, however it wasn't until the 2012 Currie Cup that he really established himself as a first team member.
2013 got off to a slow start as injury ruled him out of the first half of the Stormers season, but he did return for the final 8 games and this coincided with an upturn in his sides fortunes following a lacklustre first half of the season.