49ers' Brock Purdy questionabl...

The San Francisco 49ers listed quarterback Brock Purdy as questionable on the injury report for their Sunday matchup with the Cincinnati Bengals. He will "definitely" start if he passes evaluations, Kyle Shanahan told reporters Friday.

It's a somewhat unexpected development, considering Purdy entered concussion protocol Wednesday. He went under assessment after he began to show symptoms during the flight back to the Bay Area following the team's 22-17 loss to the Minnesota Vikings on Monday night.

The updated game status comes after the 23-year-old participated in his second consecutive practice. Purdy skipped official practice Wednesday but was able to be on the field for offense-only work. He then joined the quarterback group for limited participation during Thursday's practice.

He is expected to be cleared from the concussion program Saturday when he meets with an independent neurologist.

Wide receiver Deebo Samuel is ruled out for the upcoming game with a shoulder injury but Shanahan expects to see him back on the field in Week 10 following the team's bye week.

“He’s doing good,” Shanahan said of Samuel. “I mean, it’s a little fracture, hairline fracture in his shoulder, so we’ve got to wait for that to heal. But he’s healthy enough everywhere else, so he’s conditioned and working out, doing well, and hopefully that’ll be good after the bye week.”

Left tackle Trent Williams is listed is questionable as he continues to deal with an ankle injury. He did not play against the Vikings.

If Purdy's tests don't go as planned, he'll end a streak of 15 consecutive starts (including playoffs) and Sam Darnold will get the starting nod. Darnold joined the 49ers this past offseason after a two-year run with the Carolina Panthers. He threw for 1,143 yards last season, recording seven touchdowns and three interceptions in six games.

With San Francisco this year, Darnold has only made brief appearances in garbage time.