"He's getting his treatment every day, and we'll see what happens," Sveum said.
Sveum said Marmol will likely go to Triple-A Iowa before he returns
"We'll send him down for an inning or two to make sure he's game-ready," Sveum said.
Rafael Dolis has taken over the closer role in Marmol's absence. He picked up his fourth save with a perfect ninth inning on Monday in a 6-4 win in St. Louis.