EDEN PRAIRIE, Minn. (AP) -Minnesota Vikings receiver Troy Williamson missed practice on Thursday with headaches stemming from a concussion he sustained against the New York Giants last week.
Williamson practiced on Wednesday after being cleared by doctors but said the headaches grew worse on Thursday, so he sat out as a precaution. He said he will take it day by day and see if he is ready for this week's game against Detroit.
Running back Adrian Peterson again split time with Chester Taylor in practice and said he is still getting used to wearing a brace to protect his right knee. Peterson tore the lateral collateral ligament in his right knee three weeks ago at Green Bay.
``It really took me I would say like a good week just to really get used to it,'' Peterson said before practice on Thursday. ``It was kind of stiff at first but I really have worked into it. The brace is starting to mold over my leg and my knee so I am feeling more comfortable with it.''
Peterson has never worn a knee brace before, and coach Brad Childress said his star ``fiddles with it continuously. ... It's not natural.''
Peterson, who leads the league in rushing despite missing the last two games, said he is still breaking in the brace, but so far has been able to run and cut without much of a problem. He figures to rejoin the team on Sunday against the Lions, though no official announcement has been made yet.
``Right now I feel like I will be able to go out and play,'' said Peterson, who lobbied the coaches to activate him last week against the Giants. ``I am just going to continue to take it one day at a time and see how it feels during practice and after practice, and I will have to be able to make that decision this weekend.''
Safety Tank Williams (knee) missed his second straight day of practice, while cornerback Antoine Winfield (hamstring), fullback Tony Richardson (knee), center Matt Birk (knee) and linebacker Dontarrious Thomas (groin) were limited.
Defensive end Kenechi Udeze returned to practice after missing Wednesday because of the birth of his daughter, Bailey.

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