LINCOLN, Neb. — Hall of Fame coach Tom Osborne returned to Nebraska as interim athletic director Tuesday, a day after the firing of Steve Pederson, who came to the school from Pitt. The 70-year-old Osborne will determine whether football coach Bill Callahan stays or goes, but he won't make the decision until after the season.

Osborne retired as Cornhuskers coach 10 years ago, ending a celebrated 25-year coaching career that culminated with three national championships in his last four seasons. However, the program has fallen on hard times — by Nebraska standards — having lost no fewer than four games a year in four seasons under Callahan.

SAN DIEGO — The San Diego Chargers acquired Chris Chambers from the Miami Dolphins Tuesday in exchange for a 2008 second-round draft pick. The trade came as the Chargers put their No. 1 wide receiver, Eric Parker, on the injured reserved list with a broken right big toe. Parker has been out since June, and will miss the rest of the season.

TAMPA, Fla. — Tampa Bay acquired running back Michael Bennett from the Kansas City Chiefs Tuesday, hoping he helps them compensate for the loss of injured tailbacks Carnell "Cadillac" Williams and Michael Pittman.Bennett, a first-round draft pick of the Minnesota Vikings in 2001, has rushed for 3,426 yards and 12 touchdowns in seven NFL seasons. He also has 145 career receptions for 1,164 yards and five TDs.Tampa Bay gave up undisclosed draft picks in 2008 and 2009 based on performance criteria.