Darilek said he was told he was brought in to work at guard and center.
While we don't know yet what other roster move is coming, one has to wonder whether it might involve former Dolphins third-round pick Wade Smith.
Smith was not on the field for the portion of practice that is open to the media and he also was inactive for Thursday night's opener against Pittsburgh, Saban instead choosing to go with Kendyl Jacox, who had been signed only a few days before.
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Defensive tackle Dan Wilkinson also was missing from practice, and Saban said it because of "personal reasons."
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Saban said cornerback Travis Daniels did a little more work in practice on Monday, but remains day-to-day. The hope is that Daniels will be able to play against Buffalo.