"I should be ready to go," Marmol said. "The way I've been working, I think I'll be fine."
Clevenger has been sidelined since April 26 with a strained right oblique, and on Wednesday took 15 swings off a batting tee and another 15 swings on the side.
"It went good and felt good," Clevenger said.
Both he and Marmol have had enough of the athletic trainer's room.
"I've never really been on the DL before in my career," Clevenger said. "I'm bored. I don't like being in the trainer's room."
Clevenger is ahead of schedule and could be activated as early as May 25.
"It was supposed to be a four- to six-week injury," he said. "I'm coming along good and keep progressing every day."