Nicolas Mas will be leaving the club after 14 years
Stormers scrumhalf Dewald Duvenage is one of seven new players that will join French Top 14 club Perpignan next season.
Duvenage will make the move to the French giants along with former SA Under-20 wing Wandile Mjekevu.
However, 33-year-old French prop Nicolas Mas will be leaving the club after 14 years to join Montpellier.
Perpignan - who are challenging for a place in the end-of-season title play-offs lie seventh at present, six points adrift of Montpellier who occupy the last play-off position with two games remaining - also announced the arrival of flyhalf Camille Lopez from Top 14 rivals Bordeaux-Begles.
Also arriving at the 2009 champions - who are also in the European Challenge semifinals - are props Romanian Ion Paulica from recently-relegated English Premiership side London Welsh and Georgian Giorgi Jgenti from Montpellier.
Australian lock Justin Purll is coming with Lopez from Bordeaux while wings Mjekevu and Fijian Watisoni Votu are joining from the Sharks and English Premiership side Exeter respectively.