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Lions tigh end Eric Ebron is sidelined again after just one day of practice.

(Mike Mulholland | MLive.com)

ALLEN PARK -- It took Eric Ebron 16 days to return from his ankle injury.

And after one day of practice, he's sidelined once again.

The Detroit Lions tight end was not in pads during the 20 minutes of practice that were open to the media on Wednesday afternoon. He did attend the workout and didn't appear to be limping, though it's difficult to say for sure because the Lions have barred reporters from walking to the side of the field where the tight ends warm up.

Ebron originally injured his ankle during an intrasquad mock game on Aug. 6 at Ford Field. He had to be carted off the field. It's unclear whether his off day Wednesday is a scheduled part of his return, or if he has experienced a setback.

Coach Jim Caldwell spoke with reporters before practice, and will not be available again until Thursday.

Also missing practice were linebackers Josh Bynes and Jon Bostic; offensive linemen Michael Ola, Corey Robinson and Graham Glasgow; and safety Isaiah Johnson.

Johnson, Ola and Glasgow have not practiced since Detroit's loss against the Cincinnati Bengals on Thursay. The club will continue preseason play on Saturday night in Baltimore against the Ravens.