Vikings coach Brad Childress said rookie Percy Harvin missed practice Thursday because of a "headache." Harvin's history with migraines is well-documented. He missed one game this season because of a severe bout.

Harvin visited the Mayo Clinic recently and said he came away with a good game plan for how to deal with his migraines. Harvin had not experienced any problems since meeting with Mayo doctors.

"I think it's just a matter of trying to slow the onset," Childress said. "For a while he had them pretty often. This is the first time one has raised up. Expect him to be OK. ... He has a headache so he has to take care of it. [It's] not something you can fight through."

Childress also said he's hopeful that defensive tackle Kevin Williams and defensive end Ray Edwards can do some work in practice. Both missed their second straight day of practice because of knee injuries.

"They might get out here tomorrow," Childress said. "I'm in hopes they are, but again we'll see how much progress they make."

Limited for the Vikings were wide receiver Bernard Berrian (ankle); left guard Steve Hutchinson (shoulder), linebacker Ben Leber (knee) and cornerback Antoine Winfield (foot). Defensive tackle Jimmy Kennedy (thumb), cornerback Benny Sapp (ankle) and nose tackle Pat Williams (elbow) continued to be listed on the injury report but did not miss any practice time.

For the Saints, cornerback Malcolm Jenkins (hamstring) and tight end Jeremy Shockey (knee) did not take part in practice for a second consecutive day. Wide receiver Robert Meachem (ankle) and safety Darren Sharper (knee) were limited after sitting out Wednesday. Defensive end Bobby McCray (back) and center Jonathan Goodwin (knee) were listed on the report but did not miss any of practice.