ALLEN PARK -- Vikings quarterback Brett Favre failed one concussion test but will take another today or Friday to see if he’ll be cleared to play the Lions on Sunday at Ford Field.

“We’d love to see him play, there’s no question about that,’’ Vikings coach Leslie Frazier said in a conference call this morning. “He’s a great player and he’s helped us tremendously. We’ll have to see what happens.’’

Frazier said it will be determined today when Favre will take his next concussion test. The Vikings coach said he could take a test as late as Saturday and still be cleared to play.

Lions coach Jim Schwartz said on Wednesday the Lions are preparing for both Favre and Joe Webb who started on Tuesday night at Philadelphia.

The 41-year-old Favre suffered a concussion two weeks ago on the frozen field of the University of Minnesota stadium where the Vikings were forced to play after the roof of the Metrodome collapsed.

If he plays it could be the final NFL game for Favre who holds the NFL record in every significant passing category including 508 touchdown passes and 71,838 career passing yards.

(Follow me on Twitter @PaulaPasche.)