"He feels better," Girardi said. "He's able to do some exercises. But you're really not going to know, I think, until he swings a bat."
Nunez last played Sunday when he left the game in the fifth inning. Girardi said he hoped Nunez might be ready Friday in Kansas City but wasn't sure.
"Rib cages are tricky," Girardi said, "so you got to be sure he's OK before he goes out there."
Jack Etkin is a contributor to MLB.com This story was not subject to the approval of Major League Baseball or its clubs.