49ers' Brock Purdy in concussion protocols, ruled unlikely for Sunday game, ESPN reports

SANTA CLARA, Calif. -- Brock Purdy is in the concussion protocol, San Francisco 49ers coach Kyle Shanahan said Wednesday, jeopardizing the second-year quarterback's status for Sunday's game against the Cincinnati Bengals.

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Shanahan told reporters Purdy started having symptoms Monday night on the plane ride home from Minneapolis after the Niners' loss to the Vikings.

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Purdy already is feeling better, according to Shanahan, and will take part in some aspects of Wednesday's walk-through. There is still time for him to clear concussion protocol and start Sunday, according to Shanahan.

Backup quarterback Sam Darnold will get reps with Niners' first-team offense Wednesday.

ESPN Senior NFL Insider Adam Schefter says no NFL player placed into concussion protocol for the 2023-24 season has played the same week. The last player to be in concussion protocol who played the same week was 2022, when Pittsburg Steelers' Kenny Pickett had a concussion in Week 6 and was cleared to play in Week 7.