| | | Friday, July 22nd, 1977 | | Placed SS Randolph Beck on the 15-day disabled list. |
| Thursday, July 14th, 1977 | | Activated SP Mario Romero from the disabled list. |
| Friday, June 24th, 1977 | | Placed SP Mario Romero on the 15-day disabled list. |
| Wednesday, June 15th, 1977 | | Drafted CF Geoffrey Sharpe in the 1977 first-year player draft (Round 6, Pick 11, 119th overall pick). | | Drafted MR Pablo Domínguez in the 1977 first-year player draft (Round 7, Pick 11, 141st overall pick). | | Drafted LF Emílio Pacheco in the 1977 first-year player draft (Round 8, Pick 11, 161st overall pick). | | Drafted SP Tom Lowe in the 1977 first-year player draft (Round 9, Pick 11, 181st overall pick). | | Drafted MR Adrian MacWattie in the 1977 first-year player draft (Round 10, Pick 11, 201st overall pick). | | Promoted 3B Tom O'Neill to Double A Brownsville. | | Placed CF José Hernández on the 15-day disabled list. |
| Monday, June 6th, 1977 | | Activated RF Carlos Maez from the disabled list. |
| Monday, May 23rd, 1977 | | Placed RF Carlos Maez on the 15-day disabled list. |
| Saturday, May 7th, 1977 | | Placed 1B António Lara on the 15-day disabled list. |
| Friday, May 6th, 1977 | | Activated 1B Joe Woods from the disabled list. | | Placed LF José Hernández on the 15-day disabled list. |
| Monday, April 18th, 1977 | | Placed 1B Joe Woods on the 15-day disabled list. |
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