Should Pastornicky's rehab continue into the regular season, Ramiro Pena will fill the role of utility fielder. Pena has played third base, shortstop, second base and outfield during his career. Pastornicky has played shortstop, second base and outfield since making his MLB debut in 2012.
Pastornicky tore an ACL in his left knee on Aug. 14 when he collided with Jason Heyward in right field while playing second base and underwent surgery on Aug. 19.
Pena sustained his own season-ending injury on June 9, when he landed on his right shoulder while making two diving catches against the Dodgers. He underwent surgery on June 27.
Joe Morgan is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.