Justin Tuck doesn't see the point in teaching a seminar on playing championship football. Rather, Tuck looks at leadership as a daily demonstration of principles, a process that began Friday on the first day of practice behind the Napa Valley Marriott.

"The last thing you want is guys thinking, 'Oh, he thinks he knows it all,' because I don't," Tuck said. "The biggest thing is just coming here and going about your business, like I've always done.

"Setting a good example of how to be good in meetings, being early in meetings, taking notes, whatever it may be. That's what people watch. If they want to ask me questions, I'm all about that, too."

Tuck, 6-foot-5 and 265 pounds, was a key force in Super Bowl victories for the New York Giants after the 2007 and 2011 seasons, registering two sacks against New England's Tom Brady in each game.

After the 2013 season, when Tuck had 11 sacks -- the fourth double-digit sack season of his NFL career -- the Giants made no serious effort to sign him at age 31. Tuck agreed to a two-year, $11 million contract to join the Raiders.

Tuck's reputation as a leader preceded him, and coach Dennis Allen said he hasn't been disappointed.