| | | Monday, March 1st, 2021 | | Drafted C Juan Santos in the 2021 first-year player draft (Round 1, Pick 7, 7th overall pick). | | Drafted C Miguel Esparza in the 2021 first-year player draft (Round 1, Pick 21, 21st overall pick). | | Drafted SP Bill Smith in the 2021 first-year player draft (Round 1, Pick 26, 26th overall pick). | | Drafted MR Rich Clark in the 2021 first-year player draft (Round 2, Pick 4, 36th overall pick). | | Drafted MR José Lucero in the 2021 first-year player draft (Round 2, Pick 9, 41st overall pick). | | Drafted CL José Duarte in the 2021 first-year player draft (Round 2, Pick 16, 48th overall pick). | | Drafted CF Pedro Valentín in the 2021 first-year player draft (Round 2, Pick 26, 58th overall pick). | | Drafted SP Tom Pearce in the 2021 first-year player draft (Round 3, Pick 11, 75th overall pick). | | Drafted SP Bob Teague in the 2021 first-year player draft (Round 4, Pick 11, 108th overall pick). | | Drafted SP Pete Couch in the 2021 first-year player draft (Round 4, Pick 21, 118th overall pick). | | Drafted 2B Roberto Cisneros in the 2021 first-year player draft (Round 5, Pick 6, 137th overall pick). | | Drafted C Mark Flanagan in the 2021 first-year player draft (Round 6, Pick 6, 178th overall pick). | | Drafted SP Roberto Flores in the 2021 first-year player draft (Round 7, Pick 6, 213rd overall pick). | | Drafted 2B Albert Cross in the 2021 first-year player draft (Round 8, Pick 6, 237th overall pick). | | Drafted SP Brian Goodman in the 2021 first-year player draft (Round 9, Pick 6, 261st overall pick). | | Drafted LF Howard Eaton in the 2021 first-year player draft (Round 10, Pick 6, 285th overall pick). |
| Saturday, February 13th, 2021 | | Signed free agent SP Walt Peterson to a 1-year contract worth a total of $20,600,000. |
| Saturday, January 9th, 2021 | | Signed free agent C Loren Thomas to a 5-year contract worth a total of $93,250,000. |
| Saturday, December 26th, 2020 | | Signed free agent SS Richard Thompson to a 1-year contract worth a total of $970,000. |
| Tuesday, December 15th, 2020 | | Signed free agent 3B David Clark to a 2-year contract worth a total of $3,010,000. |
| Wednesday, November 25th, 2020 | | 2B José Rivera becomes a free-agent. | | SP António Rúbio received a 1-year contract through automatic renewal worth a total of $400,000. | | SS Lorenzo Castillo becomes a free-agent. | | C Paul Perry received a 1-year contract through automatic renewal worth a total of $400,000. | | SP Albert McDonald received a 1-year contract through automatic renewal worth a total of $400,000. | | CF Woody Slater received a 1-year contract through automatic renewal worth a total of $400,000. | | 3B Cristián Suárez received a 1-year contract through automatic renewal worth a total of $400,000. | | SS Grant Nutt received a 1-year contract through automatic renewal worth a total of $400,000. | | CF David Fairlie received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Cornell Thurman becomes a free-agent. | | 2B Dave Connor becomes a free-agent. | | 1B Yoshida Hasegawa becomes a free-agent. | | SP Michael Martin becomes a free-agent. | | MR Roy Lewis becomes a free-agent. | | CF Yoshiyuki Sakurai becomes a free-agent. |
| Sunday, November 22nd, 2020 | | RF Tony Garza received a 1-year contract through arbitration worth a total of $1,602,000. | | SP Norberto Pérez received a 1-year contract through arbitration worth a total of $2,464,000. | | SP John Blue received a 1-year contract through arbitration worth a total of $2,064,000. | | RF Francisco Gonglas received a 1-year contract through arbitration worth a total of $3,644,000. | | MR Chris Kelley received a 1-year contract through arbitration worth a total of $1,430,000. | | MR José Martínez received a 1-year contract through arbitration worth a total of $765,000. | | MR John Newton received a 1-year contract through arbitration worth a total of $4,400,000. | | MR Rafael Durán received a 1-year contract through arbitration worth a total of $2,112,000. | | 3B Kevin Bowen received a 1-year contract through arbitration worth a total of $600,000. | | LF José Canó received a 1-year contract through arbitration worth a total of $2,400,000. | | CF Eugene Delaney received a 1-year contract through arbitration worth a total of $625,000. |
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