NAPA — Charles Woodson knows a thing or two about defensive football, having played for some extremely poor defenses in his first go-round in Oakland as well as a championship level unit in Green Bay.

After the Raiders first training camp practice Friday, Woodson said he likes what he sees and wonders if all the dire predictions for a poor Raiders season might be off base.

“When I look at the way we move around, I think we’re going to be a fast-flowing defense,” Woodson said. “I think that if you can have that on any team — a team that’s willing to sell out every play and get to the ball — you’re going to be in ballgames.

“Offensively, that will take care of itself. On our side of the ball I’m anxious for the season to start and get out there and show what we are. I feel really good about that.”

After seven years in Green Bay, Woodson said it felt good to be back in Napa.

“It was a familiar feeling having been here a long time the first time around,” Woodson said. “I was just anxious to get out and run around on the field here and have a little fun out there on the first day.”

Woodson, 36, has no plans to use his veteran’s status for days camp days off. To the contrary, he expects it will be the other way around.

“My age is not going to dictate whether I practice,” Woodson said. “I’m going to take as many reps as I can . . . to stand on the sideline, that’s not what I enjoy. I like being on the field. They’re going to have to pull me off the field at times because I love being out there.

“This is a new defensive for me, new calls. I want to be out there getting the calls and the communication down.”

Regarding Woodson’s amount of practice reps, coach Dennis Allen said, “You’ve got to take each individual on a case-by-case basis, and Charles has played a lot of football at a really high level. I’m not worried about Charles Woodson. When it comes time to tee it up and play football, he’s going to be ready to go.”

Woodson, whose fans showed up en masse at the facility when he signed with the Raiders, was pleased to be back in his familiar No. 24.

“I got the jersey back in large part because of the fans,” Woodson said. “A big thank you to the fans for that.”

Tracy Porter, who wore No. 24 in the offseason while Woodson wore his college No. 2, expressed disappointment on his Twitter account Wednesday regarding having his number changed to No. 31. Porter was unavailable for comment Friday.

“Tracy and I have talked about it,” Allen said. “At the end of the day, we’re ready to move on and play football. That’s the last of our challenges right now.”

For more on the Raiders, visit the Inside the Oakland Raiders blog at ibabuzz.com/oaklandraiders. Follow Jerry McDonald on Twitter at Twitter.com/Jerrymcd.