Cardinals GM John Mozeliak announced that Chris Carpenter can't continue to throw and will likely miss the 2013 season (Twitter links via Danny Knobler of CBS Sports and B.J. Rains of FOX Sports Midwest). The 2005 NL Cy Young Award winner continues battling injuries that are preventing him from throwing.

Mozeliak said Carpenter will likely be placed on the disabled list, Ken Rosenthal of FOX Sports reports (on Twitter). By announcing his retirement, Carpenter would have to forfeit his $12.5MM salary, something he's not likely to do. The St. Louis Post-Dispatch reported earlier today that Carpenter was said to be considering retirement.

Carpenter missed most of the 2012 season with a shoulder injury. He had surgery related to nerves in his pitching shoulder after being diagnosed with thoracic outlet syndrome. The 37-year-old started three regular season games last year and started three more times in the postseason.

Carpenter told the Cardinals that he continued feeling numbness and discomfort in recent bullpen sessions, Jenifer Langosch of MLB.com reports (on Twitter). Last month, Carpenter suggested he would not necessarily rehab through another serious injury.

"If I have more health issues I’m not going to continue to try to battle through," Carpenter said, according to the Post-Dispatch.

Mozeliak said the Cardinals are "comfortable" with their current starting pitching depth, according to Bill Shaikin of the LA Times (on Twitter). Adam Wainwright, Jaime Garcia, Jake Westbrook and Lance Lynn lead the Cardinals' rotation. Trevor Rosenthal and Shelby Miller figure to compete for the fifth rotation spot, assuming the Cardinals don't bring in an outsider.

Free agent right-hander Kyle Lohse could be an option for the rotation, though a deal with Lohse would prevent the Cardinals from collecting an additional draft pick in the upcoming amateur draft. When asked about Lohse, Mozeliak said in general that the Cardinals could consider making additions (via Rains on Twitter).