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First baseman Lance Berkman's return from the disabled list may take longer than the club had hoped as he has yet to run faster than a jog since becoming unavailable to the club April 19.
Berkman said he jogged at Busch Stadium on Monday's off day but felt some stiffness in his problematic left calf Tuesday.
Matheny said he had not received any indication Berkman would leave the disabled list when eligible Friday.
Berkman had hoped to be able to play this weekend's entire series against the Houston Astros but on Tuesday played down the prospects as "a 50-50 proposition."
He added, "It's not a lead-pipe cinch, but it's a possibility."
The club is leery of pushing Berkman's return as he has experienced discomfort in the area twice. Allen Craig's return to the roster also offers a buffer.
"I've got to run. I've got to push it. I've got to go full speed and have it not feel bad the next day," Berkman said. "That's where the next step is."
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