UCLA receiver Darius Bell is expected to be out of action for two to four weeks after suffering a broken rib during the Bruins' game against California.
Bell, a junior, was injured making an 18-yard reception in the third quarter against the Bears on Saturday.
Bell came to UCLA as a quarterback, but made a successful transition to F-back this season. He has seven receptions for 143 yards, including a 34-yard touchdown catch against Colorado. He averages a team-high 20.4 yards per catch.
Joseph Fauria, Jordon James and Steven Manfro have been in the F-back rotation this season. Ricky Marvray and Damien Thigpen can also play the position.