| Tuesday, September 2nd, 1980 | Activated MR Harry Johnson from the disabled list. | Friday, August 29th, 1980 | Placed 2B Doug Howard on the 15-day disabled list. | Saturday, August 16th, 1980 | Placed SP José Villarreal on the 15-day disabled list. | Sunday, July 6th, 1980 | Placed SP Ben Davis on the 15-day disabled list. | Friday, June 20th, 1980 | Activated LF Lawrence Hale from the disabled list. | Thursday, June 12th, 1980 | Activated 3B David Bell from the disabled list. | Friday, June 6th, 1980 | Activated 1B Leonard Martin from the disabled list. | Wednesday, June 4th, 1980 | Placed LF Lawrence Hale on the 15-day disabled list. | Wednesday, May 28th, 1980 | Placed 3B David Bell on the 15-day disabled list. | Tuesday, May 13th, 1980 | Placed 1B Leonard Martin on the 15-day disabled list. | Wednesday, September 12th, 1979 | Signed pitching coach Ramón Chapa. | |
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