"I felt great," Guerrier said after making 25 pitches. "Nothing's holding me back."
Guerrier is scheduled to face hitters on Friday and pitch in a game on Sunday or Monday.
"I've been optimistic, because every day it's been feeling better," he said. "I really feel better now than when I got here. Actually, I think this has helped, getting some time off, and I can benefit from this."
In other medical news, an MRI confirmed a torn oblique for infielder Ivan De Jesus, who was already a longshot to make the team and now won't be ready for Opening Day.
"He said he feels good," manager Don Mattingly said of De Jesus. "I don't know if that helps getting him on the field any faster. He feels better than the MRI shows. But I've seen enough of obliques to know it takes two to three weeks. It just takes time."