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Cardinals go to four-man rotation, Miller to bullpen

Shelby Miller will pitch from the pen tonight, but it's unclear how long he will remain there.

A bullpen arm
A bullpen arm
Scott Rovak-USA TODAY Sports

Derrick Goold with the news:

It's hard to know how long this will last or what it means. With off-days July 21, 24, and 28, the Cardinals could easily pitch just Wainwright, Lynn, Martinez and Kelly until August. Miller suffered from mechanical issues and back pain in the last several weeks, so the "rest" reasoning given by Matheny certainly makes some sense.

But Miller has struggled all season, and it's possible that this is a bullpen trial for him. Michael Wacha will have another exam soon, and if all goes well, he could be on his way be back before too long. When Wacha returns, might Miller be the odd-man out indefinitely?

It's also easy to imagine that this could be related to a potential trade, but there's nothing that could suggest it other than the calendar.

Speaking of the calendar, Shelby had a 2.92 ERA and a 3.07 FIP at the All Star Break last season. A lot can happen in a year.