When the Mariners designated Bradley for assignment, the team had 10 days to trade, release or send him to the minors. He was making $13 million this season.
"The situation with Milton is that we determined he's not part of our future and not part of our present," Mariners general manager Jack Zduriencik said last week.
The 33-year-old Bradley hit .218 with two homers and 13 RBIs in 28 games. He was suspended for one game this season for bumping an umpire and booed by home fans for the perception he was dogging on defense.
Bradley is a career .271 hitter with 125 home runs since starting with Montreal in 2000. He has played for eight teams in the majors, including five clubs in the last five seasons.
The former All-Star hit .205 with eight home runs and 29 RBIs in 73 games for the Mariners last year. He was sidelined for the season on Aug. 17 because of knee surgery.
Bradley missed time in midseason to undergo counseling after asking the club to help him deal with personal matters. He is finishing up a $30 million, three-year contract this season.
Information from The Associated Press was used in this report.