SAN FRANCISCO, July 30 (UPI) -- San Francisco 49ers Pro Bowl running back Frank Gore broke his right hand Monday in a ball-handling drill.
San Francisco Coach Mike Nolan said Gore's hand would be put in a cast this week and would be re-examined next Monday before returning to practice.
Nolan left open the possibility of Gore missing up to four weeks.
Gore set a franchise record last season with an NFC-best 1,695 rushing yards, topping Garrison Hearst's 1998 mark of 1,570. He added 485 yards receiving for a total of 2,180 yards from scrimmage to eclipse Hearst's previous club record of 2,105 total yards.
The 49ers selected Gore in the third round of the 2005 NFL draft. He played his college football at Miami-Florida.
He led the Niners in rushing during his rookie campaign with 608 yards while playing 14 games.