<p>SANTA CLARA, Calif. — The San Francisco 49ers signed backup quarterback Josh Rosen and running back Austin Walter to one-year extensions Monday.</p>
<p>The Niners originally acquired Rosen in December when they signed him off Tampa Bay’s practice squad because they didn’t have a healthy backup quarterback.</p>
<p>He was on the roster for the final two games but didn’t get a chance to play. He’s in position to be the backup in 2021 with C.J. Beathard and Nick Mullens both eligible for free agency.</p>
<p>Rosen was originally drafted 10th overall by Arizona in 2018. He spent one season with the Cardinals before being traded to Miami when Arizona picked Kyler Murray first overall.</p>
<p>Rosen was cut by Miami last September and spent most of the 2020 season on Tampa Bay’s practice squad.</p>
<p>Rosen has appeared in 20 games with 16 starts in his career, completing 275 of 502 passes for 2,845 yards and 12 touchdowns, 19 interceptions and a 63.5 pass rating.</p>
<p>Walter played four games for San Francisco this season. He had one carry for three yards, one catch for 27 yards and five kick returns for 93 yards.</p>
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