Posted by Sabrina B. @gametimegirl

Brett Favre failed a baseline neurological exam again late Wednesday afternoon, according to the Minneapolis Star-Tribune.

The baseline test is required this season for all NFL players who sustained a concussion. Favre sat out the Vikings’ win over the Eagles on Tuesday night after suffering a concussion in a Week 15 loss to the Chicago Bears.

Vikings interim coach Leslie Frazier said in his news conference Wednesday that Favre hadn’t taken concussion tests in “three or four” days, but might give them another go Thursday. The Star-Tribune reported that Favre took the test after Frazier’s time with the media.

Frazier said Favre will start Sunday against Detroit if he can participate.

“We’d love to see him play,” Frazier said Wednesday. “It’s really not a hard decision for me. Brett is a terrific player. We feel very comfortable when he’s on the field that we have a great chance to win, so you always want to put the guy out there who is going to give you the best chance to win. If Brett is healthy I think our entire team feels very confident that we have a great chance to win when he’s the starting quarterback.”

Rookie quarterback Joe Webb made his first career in Favre’s stead against Philadelphia and played well. The sixth-round draft pick from Alabama-Birmingham completed 17 of 26 passes for 195 yards and also ran for 31 yards and a touchdown, without any turnovers.

Sunday’s game against the Detroit Lions is the final game of Favre’s historic 20-year career. Favre has said he will retire at the end of the season, but the 41-year old quarterback has changed his mind before.

Favre must pass a series of neurological exams in order to be cleared to play. With a short week to prepare, Favre’s time to prepare is limited.