Ruggiano says he has a Grade 2 strain and says the best-case scenario is for a return in three to four weeks.
Cubs put OF Ruggiano on DL, make 4 roster moves →
"Woke up (this) morning to find out Adam Greenberg and I will be teammates again this year! Dude can play," Ruggiano wrote on Twitter early Thursday. "Looking forward to Oct. 2."
Adam Greenberg to get 1-day chance with Marlins →