BASKETBALL
National Basketball Association
BOSTON CELTICS — Signed F Glen Davis.
FOOTBALL
National Football League
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TAMPA BAY BUCCANEERS — Signed LB Jeremiah Trotter to a one-year contract. Released WR Taye Biddle. Signed WR Michael Spurlock to the practice squad.
COLLEGE
BOSTON COLLEGE — Signed Al Skinner, men's basketball coach, to a contract extension through the 2012-13 season.
NEBRASKA — Signed Bill Callahan, football coach, to five-year contract extension through January 31, 2012.