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Could St. Louis Cardinals deal some lefty relief surplus?

While the St. Louis Cardinals are expected to be buyers at the trade deadline, they have surplus of one of the most desired commodities in baseball: the lefthanded relief pitcher.

Injured lefty Kevin Siegrist is expected to soon return from the disabled list. That will give St. Louis three major league lefties with Randy Choate and Same Freeman already pitching well at St. Louis (although Choate's stats are skewed by a rough mop up duty outing earlier this season.) The Redbirds also have another promising lefty in Nick Greenwood.

I wonder if the team will deal from its surplus to either restock a farm system that could be depleted by a trade for starting pitching help or a power bat or try to directly address an area of need.

While the veteran Choate could hold some value for a contending team, he's not a guy a rebuilding club like the Tampa Bay Rays or Philadelphia Phillies would covet as part of a package for aces David Price or Cliff Lee. Siegrist or Freeman, hard throwing, young southpaws, might be more desirable. But Siegrist, who set records with his stellar relief work last season, is a guy the Cardinals have talked about turning into a starting pitcher.

If the Redbirds give up Shelby Miller and/or Carlos Martinez to land a front of the rotation starter, they might need to hang on to Siegrist to help fill the void in the starting pitching depth.