The 24-year-old, a former New Zealand Under-20 international with English qualifications, joins the team as Owen Farrell gets ready to leave.
After serving as captain of England for eighteen years, the former player will join Racing 92 in France this summer.
Burke, who assisted Crusaders in winning the Super Rugby championship in 2023, has inked what Saracens refer to as a “long term deal”.
The Gallagher Premiership and our team are both excited to have Fergus on board, director of rugby Mark McCall told the club website.
We have been quite pleased by his enthusiasm and willingness to advance his game, and his playing talent and potential are evident.