| Team |
Date |
Transaction |
 |
November 18, 2020 |
RHP Alexander Guillen assigned to Wichita Wind Surge. |
 |
November 17, 2020 |
Miami Marlins signed free agent RHP Alexander Guillen to a minor league contract and invited him to spring training. |
 |
November 2, 2020 |
RHP Alexander Guillen elected free agency. |
|
September 30, 2020 |
RHP Alexander Guillen assigned to Albuquerque Isotopes from Rockies Alternate Training Site. |
 |
July 19, 2020 |
RHP Alexander Guillen assigned to Rockies Alternate Training Site from Albuquerque Isotopes. |
|
March 26, 2020 |
RHP Alexander Guillen assigned to Albuquerque Isotopes. |
 |
December 17, 2019 |
Colorado Rockies signed free agent RHP Alexander Guillen to a minor league contract and invited him to spring training. |
 |
November 4, 2019 |
RHP Alexander Guillen elected free agency. |
|
April 1, 2019 |
RHP Alexander Guillen assigned to Hartford Yard Goats from Lancaster JetHawks. |
 |
August 14, 2017 |
Lancaster JetHawks activated RHP Alexander Guillen from the 7-day injured list. |
|
August 1, 2017 |
Lancaster JetHawks placed RHP Alexander Guillen on the 7-day disabled list retroactive to July 31, 2017. |
|
April 1, 2017 |
RHP Alexander Guillen assigned to Lancaster JetHawks. |
|
March 27, 2017 |
RHP Alexander Guillen assigned to Colorado Rockies. |
 |
June 3, 2016 |
Asheville Tourists activated RHP Alexander Guillen from the 7-day disabled list. |
|
April 14, 2016 |
Asheville Tourists placed RHP Alexander Guillen on the 7-day disabled list. |
|
April 5, 2016 |
RHP Alexander Guillen assigned to Asheville Tourists from Grand Junction Rockies. |
 |
August 26, 2015 |
RHP Alexander Guillen assigned to Grand Junction Rockies from DSL Rockies. |
 |
September 23, 2013 |
DSL Rockies activated RHP Alexander Guillen from the 60-day disabled list. |
|
July 17, 2013 |
DSL Rockies placed RHP Adonis Guillen on the 60-day disabled list. |
|
January 28, 2013 |
Colorado Rockies signed free agent RHP Alexander Guillen to a minor league contract. |
|
January 28, 2013 |
RHP Alexander Guillen roster status changed by Colorado Rockies. |
