NFL preseason game, Minneapolis, Aug. 21, 2009.

Minnesota Vikings' fans head into the Hubert H. Humphrey Metrodome before their NFL preseason football game against the Kansas City Chiefs Friday, Aug. 21, 2009 in Minneapolis. The Vikings recent acquisition Brett Favre is expected to start the game

Kansas City Chiefs starting quarterback Matt Cassel throws in the first quarter against the Minnesota Vikings during their NFL preseason football game, Friday, Aug. 21, 2009 in Minneapolis.

Minnesota Vikings quarterback Brett Favre (4) is hit as he throws by Kansas City Chiefs' Corie Mays in the first quarter of their NFL preseason football game, Friday, Aug. 21, 2009 in Minneapolis.

Minnesota Vikings quarterback Brett Favre warms up for a NFL preseason football game against the Kansas City Chiefs, Friday, Aug. 21, 2009 in Minneapolis.

Minnesota Vikings quarterback Brett Favre (L) throws a pass before being hit by Kansas City Chiefs linebacker Corey Mays (R) during the first half of their NFL preseason game at the Metrodome in Minneapolis August 21, 2009.

Source : Reuters Pictures