| Wednesday, August 28th, 1957 | Activated MR Aquiles Balsemao from the disabled list. | Saturday, June 15th, 1957 | Promoted SS Arturo Ángel to Double A Kingsville. | Received CF Luis González from Double A Kingsville. | Received 3B Britt Greer from Double A Kingsville. | Received SS John Hobbs from Triple A Peterborough. | Received 3B Jim Hewitt from Triple A Peterborough. | Received 2B Iván Mejía from Triple A Peterborough. | Promoted RF Phil Beard to Double A Kingsville. | Received SS Arturo Ángel from Double A Kingsville. | Drafted LF José Granados in the 1957 first-year player draft (Round 6, Pick 9, 96th overall pick). | Drafted MR Martin Fowler in the 1957 first-year player draft (Round 7, Pick 9, 112nd overall pick). | Drafted SP Richard Miner in the 1957 first-year player draft (Round 9, Pick 9, 144th overall pick). | Drafted SP Justin Holland in the 1957 first-year player draft (Round 10, Pick 9, 160th overall pick). | Sunday, May 5th, 1957 | Activated SS Miguel Ramírez from the disabled list. | Wednesday, September 5th, 1956 | Activated CF Joe LaChance from the disabled list. | |
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