C.J. Beathard will be the No. 2 quarterback against the Broncos on Saturday night, Kyle Shanahan announced on Thursday.
In the team's first exhibition game in Kansas City, Matt Barkley was the No. 2 QB behind Brian Hoyer.
Barkley completed 10 of 17 passes for 168 yards against the Chiefs.
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Beathard went 7 for 11 with 101 yards and two touchdowns.
The 49ers traded up in the 2017 draft and selected Beathard in the third round (104th overall).