The M's signed Garland in February. He has not pitched in the big leagues since 2011 following a shoulder injury. He appeared likely to opt out of his deal with the Mariners after the team made clear that he would not make the team out of spring training. His name plate was removed from his locker Friday.
Jacobs appeared in 13 games with the Diamondbacks in 2012, which is the most games he's played in any season in the majors since 2009. He hit .279/.362/.486 in 378 plate appearance at Triple-A Reno last year.