Thompson has been diagnosed with a Grade 1 left lat strain and will not throw for 3-to-4 weeks, John Denton of MLB.com reports. Thompson was battling for a spot on the Cardinals' Opening Day roster in spring training,

JUPITER, Fla. — St. Louis Cardinals left-hander Zack Thompson has a lat strain and will be shut down for three to four weeks. Cardinals president of baseball operations John Mozeliak told reporters, including MLB.com, of the Grade 1 strain on Sunday. He said Thompson would be re-evaluated at the end of that time.