Arizona Cardinals wide receiver Michael Floyd will enter concussion protocol, Cards coach Bruce Arians announced Monday.
Arians said Floyd, who had four catches for 65 yards during Sunday's loss at the Buffalo Bills, began experiencing headaches Monday. He hit his head hard against the turf during Sunday's game and was evaluated for a concussion before returning.
Floyd isn't the first Cards receiver to undergo concussion protocol this season: John Brown missed the entire preseason due to concussion symptoms that lingered throughout most of August.
Also on Monday, Arians said punter Drew Butler will miss some time with a sprained ankle, and tight end Troy Niklas has a wrist injury that could be serious.
Arians said defensive tackle Frostee Rucker, who has missed the Cardinals' last two games with a knee injury, will not play Sunday vs. the Los Angeles Rams. Arians said Rucker is still a week away from returning.