The Springbok flyhalf has had a meteoric rise this year and the 23-year-old is regarded among the most exciting players in the world having made his Stormers debut at the age of 19.
“Sacha is a player teams around the world want, that’s the reality of modern rugby, and we’re incredibly proud that he’s chosen to commit his prime years to this jersey,” Stormers coach John Dobson said.
“This is exactly what Project 2029 is about: identifying talent early, developing it properly, and building a squad where our best players want to stay, lead and win together.
“Sacha’s journey through our system has been outstanding, and he’s still only scratching the surface. Keeping him in Cape Town is massive for our supporters and for what we’re building.”
Feinberg-Mngomezulu said the decision was about belief in the team, the city and the vision.
“Cape Town is home. I grew up supporting this team and I know what it means to the people here,” he said.
“There’s always noise and interest when things start going well, but what we have here, the squad, the coaches, the connection with our fans, is special. The ambition is clear with Project 2029, and I want to be part of what we’re building and where we’re going.
“I’m excited for the future and hungry for what we can achieve together.”