Quick injury update on 49ers running backs

Posted by ESPN.com's Mike Sando

The 49ers waived running back Thomas Clayton following his knee injury Friday night. Waived/injured was the formal designation, the team announced, which means Clayton will likely land on injured reserve once he clears waivers. Clayton has a torn ACL, the team said.

Also, fullback Zak Keasey is expected to miss eight weeks after suffering a broken forearm. The team has signed fullback Bill Rentmeester. I do not have a scouting report on Rentmeester. Do you? Update: He was with the Chargers. Big special-teams contributor in college at Wisconsin.