Deep Raiders receivers group continues to work with Andre Holmes sidelined

NAPA, Calif. -- Oakland Raiders quarterback Derek Carr expressed confidence in his deep group of pass-catchers on the day it was disclosed that receiver Andre Holmes could potentially miss the season opener.

"A battle, that's what it's been," Carr said Wednesday. "These guys have been working their tails off. There's not one guy out there that we say, 'I don't know about that guy.' Whenever they got on the field, all of them can make plays. They all bring something different, whether that's the route-running ability, the deep-ball skills, them catching it and what they do after the catch, they all have something different."

Holmes, who led the Raiders with 693 receiving yards in 2014, suffered a broken hand that will keep him out for three to four weeks, according to a report by ESPN's Adam Schefter. The Raiders open the regular season in 25 days against Cincinnati. Holmes was injured during practice Sunday. The Raiders have not commented on the report.

Holmes is expected to be a key backup along with Rod Streater, Brice Butler and perhaps Kenbrell Thompkins.

In other Raiders' notes:

  • Special teams coach Brad Seely said the obvious Wednesday: Backup running back Trent Richardson is going to have to make a contribution on special teams to make the roster. The former No. 3 overall draft pick by Cleveland is working some at kick returner.

  • There has been several spirited ping pong matches during down time at training camp. The camp star according to Carr? Head coach Jack Del Rio.

  • Cornerback Keith McGill and receiver Kris Durham didn't practice Wednesday. Per camp protocol, no reasons were given.