| Date | Transaction | |||
| 12/27/05 | Acquired 3B Troy Glaus and SS Sergio Santos from the Diamondbacks in exchange for RHP Miguel Batista and 2B Orlando Hudson. | |||
| 12/20/05 | Signed INF John McDonald to a one-year contract. | |||
| 12/8/05 | Received RHP Ty Taubenheim from the Brewers and sent LHP Zach Jackson to Milwaukee as the PTBNL in the Lyle Overbay trade; Chad Gaudin was sent to the Oakland Athletics in exchange for OF Dustin Majewski. | |||
| 12/7/05 | Acquired 1B Lyle Overbay and a player to be named later from the Brewers in exchange for RHP Dave Bush, OF Gabe Gross and Minor League LHP Zach Jackson. | |||
| 12/6/05 | Signed RHP A.J. Burnett to a five-year contract. | |||
| 12/5/05 | Traded RHP Chad Gaudin to the Oakland A's for a player to be named later. | |||
| 12/2/05 | Designated RHP Chad Gaudin for assignment. | |||
