By Matt Kawahara
ALAMEDA -- The Raiders were down two cornerbacks at practice on Wednesday -- Chris Johnson (groin) and DeMarcus Van Dyke (leg laceration) did not participate, coach Hue Jackson said.
"It's a concern, but I think we're early in the week, we'll see where we are tomorrow, the next day," Jackson said. "I think hopefully we'll get some of these guys back, get 'em back rolling."
Receivers Jacoby Ford (hamstring) and Louis Murphy (groin) also did not participate, and Murphy told reporters after practice that he "can't go" Sunday against the Jets. Darrius Heyward-Bey (knee) practiced in a limited manner, and could be seen with a helmet catching passes early in Wednesday's practice.
Tight end Kevin Boss (knee), meanwhile, went through the full practice and said he expects to play against the Jets on Sunday.
"I feel like I was ready to make that step," Boss said. "Just excited to get a few more reps and get things progressing toward playing this week."
The rest of the injury report from practice:
S Jerome Boyd, limited in practice
QB Jason Campbell (foot), limited
K Sebastian Janikowski, limited
RB Darren McFadden (shoulder), limited
S Mike Mitchell (knee), did not participate
-- Rookie receiver Denarius Moore, who broke out offensively in his second career game against Buffalo, was fielding punts along with Nick Miller at practice Wednesday. Asked if Moore could return punts against the Jets, Jackson said it was a possibility.
"Never know," Jackson said. "Absolutely. I mean, I keep telling you guys -- I know I get frosted sometimes by saying I'm going to put the best players out there. That's what I'm going to do."
Jackson also said rookie running back Taiwan Jones is an option returning kickoffs, but added that "everybody's an option right now."
"Whatever it takes to get this ball matriculated down the field or score a touchdown, that's what I'm going to do," Jackson said. "If a guy can help us win, he's going to play."