St. Louis Cardinals Injuries
O'Neill (elbow) went 0-for-4 in Double-A Springfield's loss to Amarillo on Wednesday.
Wacha (knee) is scheduled to throw a bullpen session Friday, Derrick Goold of the St. Louis Post-Dispatch reports.
Martinez (shoulder) will pitch out of the bullpen when he's activated from the injured list, Mark Saxon of The Athletic reports.
Gregerson (shoulder) feels good following two outings with Triple-A Memphis but is likely headed to Double-A Springfield for a few more rehab appearances, Jim Hayes of FOX Sports Midwest reports.
Mayers will be sidelined for a few months with a lat injury, though he won't require surgery, Jenifer Langosch of MLB.com reports.
Cecil underwent surgery on his left wrist earlier this week to address carpal tunnel issues in his wrist and forearm, Derrick Goold of the St. Louis Post-Dispatch reports.