Ponce de Leon may be called on to make a spot start Tuesday against the Brewers, Derrick Goold of the St. Louis Post-Dispatch reports.
Michael Wacha hit the injured list with a knee injury, so the Cardinals need a fill-in for at least one turn in the rotation. Ponce de Leon would be on schedule to start Tuesday and is on the 40-man roster, though the Cardinals have yet to confirm their plans.