Transactions
Transactions listed are from October 1 of previous year to April 1 of the following year.
- November 3, 1988
Traded Kevin Trudeau (minors) and Bert Blyleven to the California Angels. Received Rob Wassenaar (minors), Mike Cook and Paul Sorrento.
- November 4, 1988
Randy Bush granted Free Agency.
Jim Dwyer granted Free Agency.
Tim Laudner granted Free Agency.
Charlie Lea granted Free Agency.
Dan Schatzeder granted Free Agency.
- November 23, 1988
Signed Manny Hernández as a free agent.
- November 30, 1988
Signed Greg Olson as a free agent.
- December 4, 1988
Traded Mark Portugal to the Houston Astros. Received a player to be named later. The Houston Astros sent Todd McClure (minors) (December 7, 1988) to the Minnesota Twins to complete the trade.
- December 5, 1988
Drafted Gary Wayne from the Montreal Expos in the 1988 rule 5 draft.
- December 6, 1988
Tom Gilles selected by the Toronto Blue Jays in the 1988 minor league draft.
Signed Jim Dwyer as a free agent.
- December 7, 1988
Traded Jeff Bumgarner (minors), Steve Gasser (minors) and Toby Nivens (minors) to the New York Mets. Received Mike Santiago (minors) and Wally Backman.
- December 12, 1988
Signed Randy Bush as a free agent.
- December 19, 1988
Signed Tim Laudner as a free agent.
- December 21, 1988
Released John Christensen.
- December 30, 1988
Signed Orlando Mercado as a free agent.
- February 13, 1989
Signed Lee Tunnell as a free agent.
- February 28, 1989
Signed Carlos Pulido as an amateur free agent.
- March 20, 1989
Traded Balvino Gálvez to the New York Yankees. Received Steve Shields.
- March 21, 1989
Traded Steve Lombardozzi to the Houston Astros. Received players to be named later. The Houston Astros sent Ramon Cedeno (minors) (September 16, 1989) and Gordon Farmer (minors) (September 16, 1989) to the Minnesota Twins to complete the trade.
- March 26, 1989
Traded Keith Atherton to the Cleveland Indians. Received Carmelo Castillo.
- April 1, 1989
Signed Randy St. Claire as a free agent.
- May 16, 1989
Traded Mark Davidson to the Houston Astros. Received a player to be named later. The Houston Astros sent Greg Johnson (minors) (September 6, 1989) to the Minnesota Twins to complete the trade.
- June 5, 1989
Drafted Chuck Knoblauch in the 1st round (25th pick) of the 1989 amateur draft. Player signed June 9, 1989.
Drafted Denny Neagle in the 3rd round of the 1989 amateur draft. Player signed June 22, 1989.
Drafted Scott Erickson in the 4th round of the 1989 amateur draft. Player signed June 25, 1989.
Drafted Marty Cordova in the 10th round of the 1989 amateur draft. Player signed July 5, 1989.
Drafted Dan Masteller in the 11th round of the 1989 amateur draft.
Drafted Mike Trombley in the 14th round of the 1989 amateur draft. Player signed June 8, 1989.
Drafted George Tsamis in the 15th round of the 1989 amateur draft.
Drafted Derrick White in the 23rd round of the 1989 amateur draft, but did not sign the player.
Drafted Tom Urbani in the 29th round of the 1989 amateur draft, but did not sign the player.
Drafted Denny Hocking in the 52nd round of the 1989 amateur draft. Player signed May 15, 1990.
- June 26, 1989
Signed Kerry Taylor as an amateur free agent.
- June 29, 1989
Traded Freddie Toliver to the San Diego Padres. Received Greg Booker.
- July 31, 1989
Traded Frank Viola to the New York Mets. Received a player to be named later, Rick Aguilera, Tim Drummond, Kevin Tapani and David West. The New York Mets sent Jack Savage (October 16, 1989) to the Minnesota Twins to complete the trade.
- August 1, 1989
Manny Hernández player rights sold to the New York Mets.
- August 28, 1989
Traded Jim Dwyer to the Montreal Expos. Received a player to be named later. The Montreal Expos sent Alonzo Powell (September 16, 1989) to the Minnesota Twins to complete the trade.
- October 3, 1989
Released Steve Shields.
- October 15, 1989
Greg Booker granted Free Agency.
Orlando Mercado granted Free Agency.
Greg Olson granted Free Agency.
Kelvin Torve granted Free Agency.
Lee Tunnell granted Free Agency.
- October 22, 1989
Randy St. Claire granted Free Agency.
- November 13, 1989
Wally Backman granted Free Agency.
Carmelo Castillo granted Free Agency.
Kent Hrbek granted Free Agency.
Shane Rawley granted Free Agency.
Jeff Reardon granted Free Agency.
- December 4, 1989
Drafted Shane Mack from the San Diego Padres in the 1989 rule 5 draft.
- December 6, 1989
Signed Kent Hrbek as a free agent.
- December 29, 1989
Signed Rich Yett as a free agent.
- January 3, 1990
Released Jeff Bronkey.
- January 8, 1990
Signed Carmelo Castillo as a free agent.
- January 12, 1990
Traded Jim Davins (minors) to the Montreal Expos. Received Jim Dwyer.
- February 28, 1990
Signed John Candelaria as a free agent.
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