"I've known for a while," Griffen said.Pac-10 blog
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Griffen, who has rare speed for a 6-foot-3, 280-pounder, is viewed in most draft projections as a late-first or early-second round selection.
"I'm ready," Griffen told ESPN.com's Joe Schad. "I know it's the right decision because I've talked it over with my coaches. I will bring speed, a pass rush and the ability to stop the run."
Griffen injured his ankle in Saturday's game and watched much of it from the sideline.
"I think I was prepared for this game, but stuff happens and I've just got to bounce back and be strong," Griffen said.
He made the All-Pac-10 second team this season, recording 44 tackles and a team-high eight sacks.
Junior receiver Damian Williams, who was the game's offensive MVP with 189 receiving yards, said he is undecided about whether he will return for his senior season. Williams said he will fly home to Arkansas Sunday and talk it over with his family.
Most observers expect Williams to enter the upcoming draft.
Junior running back Allen Bradford said he will return.
Michigan Wolverines junior cornerback Donovan Warren to declare for NFL draftMessi rounds off perfect year
