Elder didn't practice Monday due to an undisclosed issue, Kyle Meinke of MLive.com reports.

EDGE Analysis

Elder signed a one-year deal with the Lions in April and was expected to compete with a starting role in the team's secondary. However, he's been working behind Mike Ford for most of camp and gained increased competition when Detroit signed Nickell Robey-Coleman on Monday. It's not yet clear whether Elder will be available for Friday's preseason game against the Bills.