The Raiders ruled out starting tight end Michael Mayer for Sunday’s game against the Bears as he continues to go through concussion protocol.

Coach Pete Carroll said Friday that Mayer, who has started all three games, still had another test to go through Saturday before a determination was made. But the answer came later Friday with the release of the injury report.

Mayer, who was involved in a scary collision last week, is the only player ruled out of the game for the Raiders.

Cornerback Decamerion Richardson is questionable with a hamstring injury that kept him out of last week’s loss to the Commanders, but he practiced in full Friday.

Ian Thomas is expected to take on an expanded role in place of Mayer. Star tight end Brock Bowers practiced in full Friday but is playing through a kn

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