New Orleans Saints quarterback Drew Brees will undergo an MRI on Monday due to a rib injury, and he is questionable to play in next week’s game against the Atlanta Falcons.

Taking a shot from Kentavius Street with eight minutes to go in the second quarter of their win against the San Francisco 49ers, Drew Brees was visibly shaken from the hit and temporarily exited the game. While a personal-foul penalty was assessed to Street–which was highly questioned by observers on social media–the quarterback was able to return to close out the half, tossing two touchdowns as the teams entered the break.

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With the injury failing to heal while in the locker room, Saints head coach Sean Payton said that Brees informed him he would be unable to continue in the game.

Despite his absence for the final two quarters, backup Jameis Winston took over the starting unit and paced the offense with a 6-of-10, 63-yard passing performance. Long stymied by his proclivity for turning the ball over–throwing an eye-popping 30 interceptions during last seasons’ campaign with the Tampa Bay Buccaneers–the former top overall draft pick avoided such turnovers as the Saints earned their sixth consecutive victory.

Should the 41-year old Brees be unavailable during their matchup against Atlanta, it is once again expected that Winston will handle the bulk of play-calling duties. While third-string quarterback Taysom Hill did receive an opportunity to guide the offense, the utility player fumbled the football twice and failed to record a pass.