Officially, the club still considers him day to day.
"We'll wait to see how it goes [Saturday]," Mattingly said. "By the end of the day, I'll know more. We feel pretty good about where he is at. We just want this throwing to go good."
One option is sliding Ryu into Paul Maholm's spot in the rotation against the Mets in New York next Wednesday. He could also be sent out for a Minor League rehab start.
Jesse Sanchez is a national reporter for MLB.com. Follow him on Twitter @JesseSanchezMLB. This story was not subject to the approval of Major League Baseball or its clubs.