The Cardinals will need a minimum of two starts from another fifth starter while Kelly recovers from a left hamstring strain. He won't be eligible to come off the disabled list until May 2 at the earliest.
Asked why the organization was not yet comfortable announcing its pitching plans, Matheny cited the potential for distraction. In calling up a pitcher from Triple-A, the club will have to make a corresponding roster move. The expectation is that one of the two relievers brought up on Thursday -- Eric Fornataro or Jorge Rondon -- will be the one sent out to create that space.
"I don't want them to look over their shoulders," Matheny said. "I just want them to worry about playing and not having a plan already in place. I just don't see the necessity of it. Now, I understand the fact that the Mets need to know and we'll give them that information as soon as we can. But we need to make sure we're doing what's right for our club, our guys, first."
Jenifer Langosch is a reporter for MLB.com. Read her blog, By Gosh, It's Langosch, and follow her on Twitter @LangoschMLB. This story was not subject to the approval of Major League Baseball or its clubs.