Offseason
- December 11, 1988: José MartÃnez was signed as an amateur free agent by the Mets.
- February 20, 1989: Don Aase was signed as a free agent by the Mets.
- March 30, 1989: Mike Maksudian was released by the Mets.
Read more about this topic: 1989 New York Mets Season