Coach Kyle Shanahan said Thursday that Allen will be San Francisco's backup quarterback behind Brock Purdy for Monday night's Week 1 game against the Jets, Eric Branch of the San Francisco Chronicle reports.

The 49ers are set to re-sign Allen as a backup quarterback, Ian Rapoport of NFL Network reports.

Allen (coach's decision) is inactive for Sunday's Super Bowl matchup against the Chiefs, but he will serve as the team's emergency quarterback, Nick Wagoner of ESPN.com reports.

Allen (coach's decision) is inactive for Sunday's game against the Bengals, but he will operate as the team's emergency quarterback, Nick Wagoner of ESPN.com reports.

Allen (coach's decision) is inactive for San Francisco's game against the Vikings on Monday, Matt Barrows of The Athletic reports.

Allen (coach's decision) is inactive for Sunday's game versus the Cowboys but available as the 49ers' emergency third quarterback, Josh Dubow of The Associated Press reports.

Allen (coach's decision) is inactive for Sunday's Week 2 game against the Rams.

Allen (coach's decision) is inactive Sunday against the Steelers.

Allen completed five of eight pass attempts for 36 yards and an interception in Sunday's preseason loss to Las Vegas.

The Bengals re-signed Allen on Friday.