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49ers-Saints Updates: Jauan Jennings, Trent Williams Suit up for Mac Jones’ Debut

Backup quarterback Mac Jones, a former first-round pick, will start for the 49ers as Brock Purdy recovers from injuries, with coach Shanahan expressing strong confidence in Jones' abilities.

  • San Francisco will start backup quarterback Mac Jones on Sept. 14, 2025, and head coach Kyle Shanahan said he `can execute the offense at a high level`.
  • After Purdy’s Week 1 toe injury, described as a turf-toe style injury, he is sidelined for multiple weeks and is a long shot for the Saints game.
  • Shanahan noted Mac Jones’s preparation and said, `'Mac’s been awesome,' Shanahan said, praising his ability to execute the offense at a high level.
  • With uncertainty about Purdy’s Week 3 availability, the 49ers must rely on Mac Jones to keep the San Francisco 49ers offense afloat while reports say they are not optimistic about Purdy’s readiness.
  • Shanahan’s system has turned ordinary QBs into starters, and Jones inherits an offense stocked with weapons despite tight end George Kittle on injured reserve through the Oct. 2 trip to Los Angeles.
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49ers Webzone broke the news in on Saturday, September 13, 2025.
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