| Sunday, September 14th, 1980 | Placed 2B José Colón on waivers. | Thursday, September 11th, 1980 | Activated CF Qing-nian Qin from the disabled list. | Wednesday, August 13th, 1980 | Signed Mark Leffler to a minor league contract with a signing bonus of $92,800. | Signed Ed Sullivan to a minor league contract with a signing bonus of $26,600. | Tuesday, August 12th, 1980 | Signed Leslie Davis to a minor league contract with a signing bonus of $102,600. | Signed Garrett McCullough to a minor league contract with a signing bonus of $38,000. | Thursday, July 31st, 1980 | Signed Eric Nicholson to a minor league contract with a signing bonus of $96,600. | Friday, April 25th, 1980 | Activated RF Miguel Valenzuela from the disabled list. | RF Sergio Gómez was designated for assignment and placed on waivers (from active). | Thursday, April 3rd, 1980 | Placed SS Justin Payne on the 9-day disabled list. | Tuesday, October 23rd, 1979 | Signed hitting coach Mathew Scott to a 4-year, $49,300 per year contract. | Saturday, October 20th, 1979 | Signed pitching coach Ken McRob to a 4-year, $46,200 per year contract. | Thursday, October 18th, 1979 | Signed team doctor Travis Armstrong to a 4-year, $72,900 per year contract. | |
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