| Friday, August 29th, 1980 | Activated C Edgardo Villa from the disabled list. | Sunday, August 17th, 1980 | Activated RF Chris Roach from the disabled list. | Friday, August 15th, 1980 | Placed SP Wynn Bird on the 15-day disabled list. | Wednesday, July 16th, 1980 | Placed C Edgardo Villa on the 15-day disabled list. | Sunday, July 13th, 1980 | Activated CF Tom Garner from the disabled list. | Wednesday, June 18th, 1980 | Activated 1B Doug Robertson from the disabled list. | Sunday, June 15th, 1980 | Received 3B Ambrose Burkett from Double A Port Lavaca. | Drafted C Miguel Salinas in the 1980 first-year player draft (Round 6, Pick 8, 112nd overall pick). | Drafted 3B Yves Richard in the 1980 first-year player draft (Round 7, Pick 8, 133rd overall pick). | Drafted 2B Rodrigo Ocasio in the 1980 first-year player draft (Round 8, Pick 8, 153rd overall pick). | Drafted SP Oliver Barrett in the 1980 first-year player draft (Round 9, Pick 8, 173rd overall pick). | Drafted SP Steve Hillard in the 1980 first-year player draft (Round 10, Pick 8, 193rd overall pick). | Tuesday, June 3rd, 1980 | Placed 1B Doug Robertson on the 15-day disabled list. | Sunday, May 25th, 1980 | Placed CF Tom Garner on the 15-day disabled list. | Sunday, December 9th, 1979 | Activated MR Arthur O'Brien from the disabled list. | Friday, November 23rd, 1979 | Placed MR Arthur O'Brien on the 15-day disabled list. | Thursday, August 23rd, 1979 | Manager Matt Johnson leaves the team, his contract was not renewed. | Signed Pitching Coach Anastasio Pérez to a 1-year contract extension. | |
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