"Maybe he'll play in the third [preseason game], maybe not," Harbaugh said. "It's really not that important for him. I want to get him right."
Webb, 28, has missed the past seven practices because of this back issue. A three-year starter, Webb led the Ravens with a career-high 22 passes defensed last season.
Webb, who started all 16 games last season, is also dealing with scar tissue from offseason sports hernia surgery. By the way Harbaugh described Webb's back injury, it doesn't sound like the six-year cornerback is in jeopardy of missing the regular-season opener, which is 36 days away.
"There are things going on in there that aren't long-term things," Harbaugh said. "This early part of camp, I just don't want to put him through this with his back. I would rather keep him out of this first part of training camp and see how it feels more toward the end of camp."