Castano, 29, logged time with the Marlins each of the last four seasons, going 2-7 with a 4.47 ERA in 17 starts and seven relief appearances. He’ll make $850,000 next season.

Castano passed through waivers unclaimed after being designated for assignment earlier this week and will likely opt to remain with the Marlins as extra pitching depth. The 28-year-old left-hander has made a pair of relief appearances this season in the big leagues.

Castano, who was just called up Sunday, allowed five runs in two innings while mopping up last night. He’ll likely clear waivers.

The left-hander has made one appearance for the Marlins this season and allowed three runs in one inning of work. He will likely pitch in low-leverage situations while with the big league club.