Vikings WR/KR kick returner Percy Harvin missed Thursday's practice because of a migraine headache, a problem that has plagued him throughout the season.
However, the league's offensive rookie of the year out of Florida is expected to play Sunday.
Harvin missed the Dec. 13 game against Cincinnati because of the headaches and visited the Mayo Clinic to address the recurring issue.
While Harvin, who practiced Wednesday, has been headache-free for more than a month, coach Brad Childress said it was unrealistic to believe the problem had been solved.
"I think it's just a matter of trying to slow the onsets," Childress said. "For a while, he had them pretty often.
"This is the first time one's raised up (in a while). We expect him to be okay."
More Vikings injuries: DT Kevin Williams and DE Ray Edwards missed their second straight practices because of knee trouble.
"They are vital cogs to our success on defense," defensive coordinator Leslie Frazier said. "You'd like to have them at 100 percent; not sure if that will be the case.
"But just their presence will make a difference."
Big yards, big plays: The Saints are not immune to giving up lots of yards. They ranked 25th in the regular season at 357.8 per game and yielded more than 400 six times. That could bode ill when facing QB Brett Favre.
But coordinator Gregg Williams said their aggressive approach sometimes means taking risks. The upside can be game-changing plays. The Saints' 39 forced turnovers (26 interceptions, 13 fumbles) were second in the league. The downside can be yards allowed.
"He doesn't want you to get personal fouls, but he always says he'll never fault you for making a mistake if you were going 100 miles an hour and your intent was there," LB Scott Shanle said.
"He just wants you playing wide open … and if you get a penalty or you miss something and you were going 100 miles per hour, he can live with that."
Saints injuries: S Darren Sharper (knee) and WR Robert Meachem (ankle) returned to practice but were limited. TE Jeremy Shockey (knee) and CB Malcolm Jenkins (hamstring) missed practice for the second straight day. However, Saints coach Sean Payton said he is optimistic all would be ready for Sunday.