"I think tomorrow might be my last bullpen. I'll see how I feel on Wednesday and we'll go from there."
If all goes well, Hellickson could be back in the starting rotation by July, if not before then.
"It's hard to say," the 26-year-old right-hander said. "I don't know what the next step will be. I just keep rehabbing and keep treating it."
Hellickson struggled last season, going 12-10 with a 5.17 ERA.
Jim Hawkins is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.