Pettis received a significant amount of the reps because last year's starter at the position, Trent Taylor, is dealing with a back injury, according to head coach Kyle Shanahan.
"His back's bothering him," Shanahan said. "He went a little bit yesterday, and he just wasn't looking right, so we pulled him out. We didn't let him go today. It will be week-to-week."
The 49ers made Taylor a fifth-round draft pick out of Louisiana Tech last year. During his rookie season, he registered 43 receptions for 430 yards with two touchdowns.
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