Matthew Barrows of the Sacramento Bee reports San Francisco 49ers center Eric Heitmann suffered a broken left fibula during Monday morning's practice.

Barrows adds that the 49ers are determining whether or not Heitmann sustained any damage to his ankle, and the low-end for his recovery time is six-to-eight weeks.

A seventh-round pick (239th overall) out of Stanford in 2002, Heitmann has started 114 of 119 games during his eight-year career with the 49ers. Heitmann has started all but two games over the six seasons, finishing 2006 on injured reserve after breaking his left tibia against the Seattle Seahawks.

Guards David Baas and Tony Wragge, and center Cody Wallace, are expected to compete to be Heitmann's temporary replacement at the start of the regular season.