The 29-year-old spent six of seven major league seasons with the Rays. In 519 career games with Tampa Bay and Boston, he hit .278 with 60 homers and 262 RBIs.
Baldelli played in just 10 games last season, but was part of Rays' postseason roster. He was removed after going 0 for 3 with two strikeouts against Cliff Lee in Game 1 of the Rays' division series against Texas.
Baldelli missed all or parts of four seasons because of a variety of injuries. In 2008, he was diagnosed as having mitochondrial disorder, a condition that causes muscle fatigue.
When he was removed from Tampa Bay's playoff roster in October, the Rays cited "left leg fatigue."
Baldelli will be involved in scouting and player development in his new job as special assistant to baseball operations.