| Sunday, August 24th, 1980 | Activated SS Paul Wallace from the disabled list. | Friday, July 25th, 1980 | Activated SS Emílio Suárez from the disabled list. | Monday, July 21st, 1980 | Placed 2B Edgar Soto on the 15-day disabled list. | Saturday, July 12th, 1980 | Placed SP J.J. Sheppard on the 15-day disabled list. | Sunday, June 15th, 1980 | Drafted 2B Alan Baker in the 1980 first-year player draft (Round 6, Pick 3, 107th overall pick). | Drafted SP Roberto Silva in the 1980 first-year player draft (Round 7, Pick 3, 128th overall pick). | Drafted SS Emílio Suárez in the 1980 first-year player draft (Round 8, Pick 3, 148th overall pick). | Drafted MR Mitchell Williams in the 1980 first-year player draft (Round 9, Pick 3, 168th overall pick). | Drafted MR José Garza in the 1980 first-year player draft (Round 10, Pick 3, 188th overall pick). | Thursday, August 23rd, 1979 | Signed Manager Ánibal Peña to a 1-year contract extension. | |
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