Beathard tossed two touchdowns to speedy receiver Marquise Goodwin in San Francisco's 33-30 setback to the Green Bay Packers on Monday night. The 24-year-old Beathard, however, was undone by a late interception that helped the Packers send the 49ers (1-5) to their fourth straight loss.
"We have 100 percent confidence in C.J. Everyone else thinks of him as a backup. He is not a backup. The guy is a starter. He runs our offense really, really well," Staley said.
Staley also defended his quarterback on the play that ended up being an interception.
"The guy was trying to make a play," the 34-year-old Staley said. "It was one-on-one coverage down the field with Marquise. He was trying to let his guy make a play.
"We have 100 percent confidence in C.J. We can't go two series of three-and-outs at the end of the game. It is on everybody, not just one person."
Beathard has completed 73-of-114 passes for 892 yards with six touchdowns and five interceptions since fellow quarterback Jimmy Garoppolo was lost for the season with a knee injury.