"Time-frame wise, we don't know," manager Mike Redmond said. "He's not going to do anything for about three days, and then he will start moving around and see how it is."
Stanton sustained the injury in the 10th inning of Monday's 4-3 win over the Mets in a game that lasted 15 innings. While batting, Stanton tapped a grounder in front of the plate. Sprinting all out in a tie game at the time, the 23-year-old pulled up as he crossed first base. He reached for his hamstring and stumbled to the ground.
After the five-hour, 31-minute game, the Marlins announced Stanton was heading to the disabled list.
Hamstring strains are graded one through three, with three being the most severe. A Grade 3 strain typically involves a tear to half or all of the muscle.
Stanton's situation is less severe, but he continues to walk with a limp, and his treatment will involve steady icing.
"It can always be worse," Stanton said. "We'll just see how it goes. I will kind of relax until I can work normally and feel better. You just ice every hour or so."
Earlier this season, Stanton missed five games with a bruised left shoulder. In 20 games, he is batting .227 with three homers and nine RBIs. The injury comes when he was starting to heat up at the plate. On Saturday and Sunday against the Cubs, he combined for three home runs.
With Stanton on the disabled list, the Marlins called up prospect Marcell Ozuna from Double-A Jacksonville to play right field. For the Suns, Ozuna was batting .333 with five home runs and 15 RBIs.
Although Ozuna offers power potential, losing Stanton is a serious blow to a Miami offense that was already struggling to score runs.
"We will have to wait and see how long before he starts moving around," Redmond said. "I guess it's better news than having a tear or something more extreme. A strain, I guess, is good. But those hamstrings can be touchy, too. We'll see how it goes."