The defending champion Golden State Warriors will be without a key starter for an indefinite period of time. Center Andrew Bogut suffered a concussion in Tuesday night's season-opening victory over the New Orleans Pelicans and will not be able to return to the court until he undergoes and passes the NBA's concussion protocol. [ Yahoo Fantasy Basketball: Sign up for a league today ] Bogut experienced the injury in the third quarter when Pelicans forward Dante Cunningham made contact with his head. Already playing with a mask to protect a broken nose, Bogut left the game with a laceration over his right eye, received stitches, and did not return as the Warriors won comfortably. Take a look at the play here: While the play did not appear especially dirty at first glance, Bogut took issue with Cunningham's actions: Basketball or soccer yesterday? Was he going for a header or........? — Andrew Bogut (@andrewbogut) October 28, 2015 Watch the replay with glasses RT @sarinibanini : @andrewbogut isn't that like the 5th time it's happened to you. Me thinks it's you not them. — Andrew Bogut (@andrewbogut) October 28, 2015 Part of the issue could be that the seven-season veteran...