The 29-year-old Kolisi has amassed 50 Test caps since his Bok debut in 2013, the last of which was the epic Rugby World Cup final against England in Japan, which South Africa won by 32-12.
Apart from his half-century of Test caps, Port Elizabeth-born Kolisi also played in 115 Vodacom Super Rugby matches for the DHL Stormers and represented the Junior Springboks in eight matches over two seasons in 2010 and '11.
“I bought into the vision of the Sharks immediately – the energy around the club, the management set-up, the squad and the potential for success was so strong," said Kolisi.
“I have always had a desire to be the best, and play with the best, to reach my potential on-and-off the field, and this move is just another step in maximising what I can achieve within my career.
“This is a very exciting new chapter for me and my loved ones, and one I am embracing fully. I arrive with a commitment to give this team everything I have, and I’m thankful to the Sharks for the opportunity. We can’t wait to see what Durban has to offer.”
Kolisi’s ongoing strong appetite to win trophies and better himself on the field, matched with the Sharks' strategic vision and defined blueprint for success, drove the Bok captain's motivation to expand his horizons within South African rugby, and embark on this exciting new chapter in Durban.
Commenting on his signing, The Sharks CEO Dr Eduard Coetzee said: “We are delighted to welcome Siya and his family to the Cell C Sharks. We pride ourselves on being a family unit who support and treat each other unbelievably well and a player of Siya’s pedigree is a welcomed addition to the team.
“He is a class act and undoubtedly a great ambassador for the game and is someone whom our young players will certainly draw inspiration from. We are confident that Siya will fit in seamlessly into our team environment and will thrive with the unique culture that we have in Durban.”