| Saturday, June 15th, 1957 | Released SS John Hobbs. | Released 3B Jim Hewitt. | Promoted SP Bernardo Ruíz to Double A Beeville. | Promoted C Jorge Ramos to Double A Beeville. | Received SP Jason Lane from Double A Beeville. | Received 1B Jorge Ortíz from Double A Beeville. | Received 1B Nick Williams from Double A Beeville. | Drafted SP Sergio Aquino in the 1957 first-year player draft (Round 6, Pick 14, 101st overall pick). | Drafted 2B Dale Aberdein in the 1957 first-year player draft (Round 7, Pick 14, 117th overall pick). | Drafted MR José López in the 1957 first-year player draft (Round 8, Pick 14, 133rd overall pick). | Drafted 2B Armando Pérez in the 1957 first-year player draft (Round 9, Pick 14, 149th overall pick). | Drafted MR Claudio Sierra in the 1957 first-year player draft (Round 10, Pick 14, 165th overall pick). | Thursday, April 18th, 1957 | Released 3B Joey Evans. | Thursday, April 11th, 1957 | Placed SP Norberto Medina on the 15-day disabled list. | Monday, August 27th, 1956 | Signed Pitching Coach Armando Romero to a 1-year contract extension. | Signed Hitting Coach José Torrez to a 2-year contract extension. | |
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