"Hart has been out running four days now without trying to take the weight off it," Roenicke said. "That is a good sign; we're still probably a couple weeks away from him going out on a rehab. That's kind of guessing -- I don't mean exactly -- but we're somewhere in there. Then we'll see how long he goes out for."
Roenicke added that Narveson had thrown a light bullpen session.
"He did that three days ago," Roenicke said. "I think we will have a few of those with him, and then get him some live hitters."
George Von Benko is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.