Starting center Eric Heitmann broke his left fibula during this morning's practice, according to a source with knowledge of the injury. The fibula is the smaller and more slender of the two bones in the lower leg. The 49ers are checking to see if there is any ankle damage associated with the injury. If there isn't, Heitmann is expected to be out from six to eight weeks. Heitmann suffered the injury while pulling into the right flat on a running play. Heitmann broke his left tibia during a game in Seattle in 2006 and missed the rest of that season.
With Heitmann likely to miss a few games early this season, David Baas and Tony Wragge will compete for the starting job at that position. Wragge has gotten the lion's share of the work so far in training camp because Baas was out with a concussion. Baas is back now, and coaches want to see what he can do at the position. Heitmann's injury also means that Cody Wallace, a fourth round draft pick in 2008, will see more snaps at center.
-- Matt Barrows