Transactions
Transactions listed are from October 1 of previous year to April 1 of the following year.
- November 9, 1989
Traded Tracy Woodson to the Chicago White Sox. Received Jeff Bittiger.
- November 12, 1989
Signed Henry Blanco as an amateur free agent.
- November 13, 1989
Dave Anderson granted Free Agency.
John Shelby granted Free Agency.
John Tudor granted Free Agency.
Fernando Valenzuela granted Free Agency.
- December 4, 1989
William Brennan drafted by the Houston Astros in the 1989 rule 5 draft.
Signed José Parra as an amateur free agent.
- December 5, 1989
Drafted Mike Christopher from the New York Yankees in the 1989 minor league draft.
- December 7, 1989
Signed Jim Gott as a free agent.
- December 12, 1989
Traded Manny Francois (minors) and Joe Kesselmark (minors) to the Cleveland Indians. Received Steve Davis.
- December 15, 1989
Signed Fernando Valenzuela as a free agent.
- December 19, 1989
Signed John Shelby as a free agent.
Mike Davis granted Free Agency.
- December 20, 1989
Traded Mike Marshall and Alejandro Peña to the New York Mets. Received Juan Samuel.
- December 21, 1989
Signed Hubie Brooks as a free agent.
Signed Mike Maddux as a free agent.
- January 9, 1990
Signed Butch Davis as a free agent.
- January 26, 1990
Signed Pat Perry as a free agent.
- February 10, 1990
Signed Roberto Durán as an amateur free agent.
Signed Willis Otáñez as an amateur free agent.
- February 20, 1990
Signed Don Aase as a free agent.
- April 1, 1990
Traded Franklin Stubbs to the Houston Astros. Received Terry Wells.
- May 13, 1990
Traded Willie Randolph to the Oakland Athletics. Received Stan Javier.
- May 19, 1990
Signed Darío Veras as an amateur free agent.
- June 2, 1990
Released John Shelby.
- June 4, 1990
Drafted Mike Busch in the 4th round of the 1990 amateur draft. Player signed June 8, 1990.
Drafted Steve Mintz in the 17th round of the 1990 amateur draft. Player signed June 7, 1990.
Drafted Michael Mimbs in the 24th round of the 1990 amateur draft. Player signed June 11, 1990.
Drafted Mark Sweeney in the 39th round of the 1990 amateur draft, but did not sign the player.
Drafted Todd Williams in the 54th round of the 1990 amateur draft. Player signed May 21, 1991.
- August 24, 1990
Signed Omar Daal as an amateur free agent.
- September 13, 1990
Traded Darrin Fletcher to the Philadelphia Phillies. Received Dennis Cook.
- September 20, 1990
Signed Miguel Cairo as an amateur free agent.
- September 21, 1990
Signed Barry Lyons as a free agent.
- September 30, 1990
Traded Mike Munoz to the Detroit Tigers. Received Mike Wilkins (minors).
- October 8, 1990
Don Aase granted Free Agency.
- October 15, 1990
- November 5, 1990
Rick Dempsey granted Free Agency.
Kirk Gibson granted Free Agency.
Mickey Hatcher granted Free Agency.
Juan Samuel granted Free Agency.
Fernando Valenzuela granted Free Agency.
- November 8, 1990
Signed Darryl Strawberry as a free agent.
- November 16, 1990
Pat Perry granted Free Agency.
- December 3, 1990
Mike Huff drafted by the Cleveland Indians in the 1990 rule 5 draft.
Signed Kevin Gross as a free agent.
- December 13, 1990
Released Luis Lopez.
- December 14, 1990
Signed Brett Butler as a free agent.
Traded José Vizcaíno to the Chicago Cubs. Received Greg Smith.
- December 15, 1990
Released Ray Searage.
Traded Hubie Brooks to the New York Mets. Received Greg Hansell and Bob Ojeda.
- December 16, 1990
Signed Juan Samuel as a free agent.
- December 19, 1990
Signed Mickey Hatcher as a free agent.
Signed Fernando Valenzuela as a free agent.
- December 20, 1990
Terry Wells granted Free Agency.
Traded Darren Holmes to the Milwaukee Brewers. Received Bert Heffernan.
- December 30, 1990
Traded Jim Poole and cash to the Texas Rangers. Received Steve Allen (minors) and Dave Lynch (minors).
- January 15, 1991
Traded Kevin Campbell to the Oakland Athletics. Received Dave Veres.
- March 3, 1991
Signed Roger Cedeño as an amateur free agent.
- March 25, 1991
Signed John Candelaria as a free agent.
- March 26, 1991
Signed Gary Carter as a free agent.
- March 28, 1991
Released Fernando Valenzuela.
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