Lakers point guard Steve Nash was diagnosed with a "small non-displaced fracture in the head of his fibula," according to a statement released by the team.
Nash underwent an MRI exam on his left leg, which was injured in Wednesday night's game against the Portland Trail Blazers.
Team doctor Steve Lombardo made the diagnosis, which will keep Nash out for at least a week, when he'll then be re-examined.
Nash was acquired over the summer in trade from the Phoenix Suns.
The Lakers have started the season 0-3 after losing all eight of their exhibition games. Steve Blake is the likely starter in Nash's absence.