Eckstein did not play Saturday against the Florida Marlins, after missing the Friday's contest against the New York Mets.
The Cardinals will be very careful not to rush the popular shortstop back into the lineup, as he missed nearly a month with a similar injury last season.
Eckstein is in the final year of a three-year deal and fans are urging the Cardinals to get the shortstop signed to an extension sooner than later.
"Right now we've had just peripheral talks," assistant GM John Mozeliak said in an exclusive interview with the St. Louis Post Dispatch's Derrick Goold. "Nothing has been set in stone. I think just moving ahead at some point we're going to have to look into it."
Last season Eckstein was selected to his second career All-Star Game, for the season he hit .292 with a .350 OBP and 68 runs scored in 123 games.
The shortstop suffered a strained left oblique muscle on August 18 that caused him to miss more than a month. Only three days after returning from that he left a game with a moderate strain of his left hamstring. He returned to his regular spot in the lineup on September 29. He struggled in the first two rounds of the postseason, but hit .364/.391/.500 in the World Series, and was named MVP of the series.
Utility infielder Aaron Miles will see the bulk of the playing time at short, while Eckstein is sidelined.
EDITOR's NOTE - INJURY UPDATE
Matthew Leach of MLB.com is reporting that Dr. Paletta, the St. Louis Cardinals head physician said that Eckstein's injury is much less severe than the one he suffered last August, and that the World Series MVP could be playing within a week.
Eckstein appears likely to return in less than two weeks as we initially reported.