Detroit Lions running back D'Andre Swift has been ruled out of Sunday's game against the Carolina Panthers after suffering a concussion, Michael Rothstein of ESPN.com reports.

Running backs coach Kyle Caskey made the announcement Friday.

Swift practiced Wednesday in full and then spoke with the media following practice. He was not at practice Thursday and later in the day was listed with a concussion. On Friday morning, before Swift had been ruled out, Lions coach Matt Patricia said it would be "difficult" for Swift to clear protocol in time to play against the Panthers.

Patricia and Caskey both declined to say how or when the concussion happened. "Just something that came up and wanted to make sure that we're doing our due diligence there, making sure that he was OK and that's just how they saw it," Patricia said. "We'll be careful and make sure he's out there as soon as he can based on the protocols and the protocols are what they are and the timeline, it's pretty tight."

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