Update: On Monday, the 49ers officially announced the signing of Rosen to a one-year deal.
Rosen did not play in either of the 49ers' final two games of the season but practiced with the team in Glendale, Arizona, and was active for both matchups.
The Arizona Cardinals drafted Rosen out of UCLA with the No. 10 overall pick in 2018. He last played with the Miami Dolphins during the 2019 season, completing 58-of-109 passes for 567 yards with a touchdown and five interceptions through six games.
Rosen, 23, has completed 54.8 percent of his passes for 2,845 yards with 12 touchdowns and 19 interceptions through his first two NFL seasons.
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