SANTA CLARA -- B.J. Daniels is officially part of the competition for the 49ers' No. 2 quarterback, but there could a delay to his entrance.

Coach Jim Harbaugh said Sunday that Daniels will begin receiving equal repetitions as fellow backups Colt McCoy and Scott Tolzien. But Daniels did not participate in the team's afternoon practice.

Daniels was seen in the weight room as players were on the field stretching. He briefly came to the practice field during individual drills but left for the locker room when team drills began, which was also when practice was closed to the media.

No information was immediately available as to why Daniels was not participating.

The rookie emerged as a candidate for the primary backup spot to Colin Kaepernick after leading a game-winning touchdown drive against Kansas City on Friday, the 49ers' first touchdown drive of the preseason.

"It was an encouraging performance," Harbaugh said. "If someone does a good job, you give them a little more."

McCoy and Tolzien have been the leading candidates to serve as Kaepernick's backup, but neither have impressed during the first two preseason games. Tolzien has completed 18 of 34 passes for 188 yards and an interception. McCoy is 6 of 13 for 76 yards and two picks.

Meanwhile, Daniels guided San Francisco on a 13-play, 90-yard drive that resulted in a 14-yard touchdown pass to Chuck Jacobs to provide the difference in a 15-13 win over the Chiefs. He completed 6 of 9 passes for 72 yards in his NFL quarterback debut.

Daniels -- who has also seen work at running back and kick returner -- seemed pleased with the idea of the increased workload when speaking before practice, but said he's too busy to focus on his number of practice reps.

"I haven't been keeping track," Daniels said. "I'm flying around the field, doing special teams and things like that. It's not ever something I've really focused on."

If Daniels is injured, he didn't let that on when speaking to the media. He spoke only about being "blessed to even be drafted here" and wanting to stay "consistent and help out the team any way that's possible."

Daniels' college career ended last November with a broken ankle, an injury he thought may stifle any plans he had at an NFL career.

"It was just one of those things that crept into my thoughts," Daniels said of the possibility of the injury thwarting his professional future. "Fortunately it didn't stop me."

Follow Jimmy Durkin at Twitter.com/Jimmy_Durkin.