Both players will receive $1 million buyouts.
Santana's option was for $14 million, while Morrison's option was for $8 million.
Santana underwent surgery on his right middle finger in early February and didn't make his first appearance until July 25. He posted an 8.03 ERA and went 0-1 in five starts before being shut down for the remainder of the campaign.
Santana is a two-time All-Star, including an appearance for Minnesota in 2017. He went 16-8 with a 3.28 ERA in 33 starts that season.
Morrison batted just .186 with 15 homers and 39 RBIs in 95 games before undergoing season-ending surgery on his left hip in August.
Morrison is expected to miss part of the 2019 campaign while recuperating.
The 31-year-old Morrison has a .239 career average with 137 homers and 421 RBIs during nine seasons with the Marlins (2010-13), Seattle Mariners (2014-15), Tampa Bay Rays (2016-18) and Twins. He smacked a career-best 38 homers for the Rays in 2017.
Santana and Morrison join first baseman Joe Mauer, second baseman Logan Forsythe, catcher Chris Gimenez and right-handed reliever Matt Belisle as free agents.
--Field Level Media
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