Adrian Peterson says ankle improving

EDEN PRAIRIE, Minn. -- Vikings running back Adrian Peterson is just trying to get healthy.

Peterson has a sprained right ankle that he sidelined him in the second half of Sunday's win over Washington.

"The pain has went away, and the flexibility is getting back to where it needs to be," Peterson said. "It's feeling good."

He didn't practice Wednesday or Thursday, but the plan is to participate Friday. His hope, of course, is to play against Buffalo on Sunday.

"I know my training staff will make sure I'll be ready to go," Peterson said. "And I know my body better than anybody else, so if I can go I'll definitely be going."

He tried to persuade the team to let him back in the game last week, even with pain he described as throbbing, but Peterson insisted he'll be smart about not pushing too hard.

Meanwhile, wide receiver Percy Harvin is dealing with another migraine headache.

Harvin didn't practice Thursday. Interim head coach Leslie Frazier says he hopes Harvin can participate Friday.

Frazier will likely have several game-time decisions to make Sunday before the Vikings play the Buffalo Bills. Besides Peterson, a sprained ankle has kept defensive end Ray Edwards out of practice this week. Same goes for left guard Steve Hutchinson, who has a cast on his broken thumb.

Frazier says he hopes Edwards and Hutchinson can join Peterson at practice Friday.

Wide receiver Greg Lewis (concussion), wide receiver Sidney Rice (hip) and cornerback Chris Cook (knee) did not practice Thursday either. Frazier said Rice was out as a precaution.

Information from The Associated Press contributed to this report.