| Tuesday, August 19th, 1980 | Placed SP Robby Branch on the 15-day disabled list. | Friday, July 25th, 1980 | Placed SP Jack Roberts on the 15-day disabled list. | Thursday, July 3rd, 1980 | Activated SP Michael Rhodes from the disabled list. | Thursday, June 19th, 1980 | Activated 2B Octávio Toledo from the disabled list. | Sunday, June 15th, 1980 | Promoted SP Pedro Padilla to Double A Corpus Christi. | Promoted CF Ernesto Valle to Double A Corpus Christi. | Received 2B Ezra Wilson from Double A Corpus Christi. | Drafted SP Pat Wallace in the 1980 first-year player draft (Round 6, Pick 15, 119th overall pick). | Drafted C Dave Mack in the 1980 first-year player draft (Round 7, Pick 15, 140th overall pick). | Drafted MR Theodore Ray in the 1980 first-year player draft (Round 8, Pick 15, 160th overall pick). | Drafted 2B Wijnand Asseldonk in the 1980 first-year player draft (Round 9, Pick 15, 180th overall pick). | Drafted SP Eduardo Miranda in the 1980 first-year player draft (Round 10, Pick 15, 200th overall pick). | Promoted 1B José Espinoza to Double A Corpus Christi. | Received CF Ernesto Valle from Double A Corpus Christi. | Placed SP Roberto Rodríguez on the 15-day disabled list. | Wednesday, June 11th, 1980 | Activated 1B José Espinoza from the disabled list. | Thursday, May 29th, 1980 | Placed LF Franklin Barnard on the 15-day disabled list. | Sunday, April 20th, 1980 | Placed CF Juan García on the 15-day disabled list. | Tuesday, April 15th, 1980 | Placed CF David Donaldson on the 15-day disabled list. | Thursday, August 23rd, 1979 | Activated LF Jonathan Gates from the disabled list. | |
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