Marlins pitchers and catchers report on Feb. 20.
Haren was acquired from the Los Angeles Dodgers last month along with second baseman Dee Gordon and infielder Miguel Rojas, with the Marlins dealing Andrew Heaney, Enrique Hernandez, Chris Hatcher, and Austin Barnes to the Dodgers.
Haren reportedly told the team that he wanted to consult with his family before deciding if he wanted to play for Miami.
Before he was dealt, Haren said he “had no interest in playing in a city away from my family" and reportedly told the Marlins just last week that he had no intentions of playing for them and hoped for a trade.
Haren is originally from Southern California, and Miami would have received cash or another player had Haren decided not to pitch this season.
Haren, 34, exercised his $10 million player option for the 2015 season. He had arthroscopic surgery on his left shoulder to clean out bursitis and the AC joint after the season. Haren had a 13-11 record with a 4.02 ERA and 145 strikeouts in 32 starts with the Dodgers in 2014.
- Scooby Axson