| Tuesday, September 23rd, 1980 | Activated LF Manuel Flores from the disabled list. | Tuesday, September 2nd, 1980 | Activated 2B Júlio Asconcio from the 60-day disabled list. | Sunday, August 31st, 1980 | Activated 2B Luis Sánchez from the 60-day disabled list. | SS José Zapata was designated for assignment and placed on waivers (from active). | Sunday, August 17th, 1980 | Purchased the contract of CL Bobby Shelton from Triple A Kitchener. | MR Joe Allen was designated for assignment, placed on waivers and taken off the 40-man roster. | Sunday, July 20th, 1980 | Signed José Espinosa to a minor league contract with a signing bonus of $90,400. | Saturday, July 19th, 1980 | Signed Phil Casey to a minor league contract with a signing bonus of $406,900. | Sunday, June 29th, 1980 | Signed Dave Brown to a minor league contract with a signing bonus of $160,400. | Signed Víctor Gómes to a minor league contract with a signing bonus of $21,900. | Saturday, March 29th, 1980 | Placed CF Ben Bennett on the 60-day disabled list. | |
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