Offseason
- December 4, 1989: 1989 rule 5 draft
- Sil Campusano was drafted from the Blue Jays by the Philadelphia Phillies.
- Steve Wapnick was drafted from the Blue Jays by the Detroit Tigers.
- December 5, 1989: Mike Maksudian was drafted by the Blue Jays from the Miami Miracle in the 1989 minor league draft.
- December 7, 1989: José Núñez was traded by the Blue Jays to the Chicago Cubs for Paul Kilgus.
- December 17, 1989: Ernie Whitt and Kevin Batiste were traded by the Blue Jays to the Atlanta Braves for Ricky Trlicek.
- January 10, 1990: Tilson Brito was signed as an amateur free agent by the Blue Jays.
- January 29, 1990: Jim Eppard was signed as a free agent by the Blue Jays.
Read more about this topic: 1990 Toronto Blue Jays Season