Both parties came together to celebrate the partnership in Las Vegas, of which members of San Manuel Casino and the Raiders were present at a private event.
As well as this new partnership, San Manuel also supports nine other professional sports teams across the NFL, NHL, MLB and the MLS.
CEO of San Manuel Band of Mission Indians Loren Gill said: "The popularity of the Raiders in Southern California is unmatched.
"Through this partnership, we are thrilled to offer our guests more access to high-quality sports and entertainment."
Raiders President Marc Badain said: "We are pleased to have San Manuel Casino as a founding partner of Allegiant Stadium.
"Together we remain aligned in our dedication to providing our fans with the best-in-class experience."
