The 49ers placed Mullens (elbow) on injured reserve Friday, Nick Wagoner of ESPN.com reports.

Mullens suffered a season-ending injury Week 15 that may require Tommy John surgery to repair the UCL in his right elbow. The true nature of the issue hasn't been confirmed, but the 49ers now have done the expected and opened up a spot on the active roster with his placement on IR. C.J. Beathard will lead the offense for the final two contests of the campaign, with new signee Josh Rosen backing him up.

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