Ozuna was placed on the 15-day disabled list retroactive to Tuesday and was scheduled to undergo surgery Friday in Miami. He was playing center field at Colorado on Monday when he sustained the injury -- torn ligaments and an avulsion fracture -- making a diving catch on a sixth-inning drive by Michael Cuddyer.
Ozuna remained in the game, and afterward, was initially optioned to Double-A Jacksonville. With the thumb still bothering him, however, he traveled first to Miami to have team doctors examine him and they learned of the severity of the injury on Wednesday.
"It's a minimum 6-8 weeks, then you have to ramp up from there," Marlins manager Mike Redmond said. "So, we're going to run out of time this season.
"Just like any player, he's going to have to come out and make the team next year. He did a great job. That's how it goes. He makes a game-saving catch, gets hurt, and ends up on the DL. It's really unfortunate. He did a great job and he needed this time to work on some things. It's too bad all the way around."
Ozuna batted .265 with three homers and 32 RBIs in 70 games this season.