What Purdy’s concussion status means for Darnold, 49ers in Week 8

SANTA CLARA — Brock Purdy has entered the NFL's concussion protocol, and time is the quarterback's enemy in order to be cleared for the 49ers' next game. Coming off two consecutive losses, the 49ers were dealt another big blow when Purdy first reported concussion symptoms on the team's flight home after the Monday night loss against the Minnesota Vikings. Next up for the 49ers is Sam Darnold, who beat out Trey Lance during training camp to serve as Purdy's backup. The return-to-play protocol consists of five phases. Purdy was scheduled to take part in the 49ers' walk-through activity on Wednesday, which signals he is back to his baseline level. But because of Purdy's later-than-normal start to the five-part return-to-play protocol, the 49ers very well could take the field with Darnold on Sunday against the Cincinnati Bengals. The 49ers (5-2) will look to avoid a three-game losing streak before heading into the bye week. Purdy has been exceptional since taking over last season due to injuries to Trey Lance and Jimmy Garoppolo, so he obviously gives the 49ers their best chance to win. But his worst two statistical games have come in the past two weeks in losses to the Cleveland...