Minnesota Vikings' quarterback Brett Favre (4) looks to pass against the Kansas City Chiefs during the first half of a NFL preseason football game, Friday, Aug. 21, 2009 in Minneapolis. (AP Photo/Paul Battaglia)

Kansas City Chiefs fullback Jed Collins, front, is pushed out-of-bounds at the goal line by Minnesota Vikings safety Jamarca Sanford, back, with less than a minute to play during the fouth quarter of a NFL preseason football game Friday, Aug. 21, 2009 in Minneapolis. Minnesota won 17-13.(AP Photo/Tom Olmscheid)

Kansas City Chiefs' running back Jackie Battle (26) has the ball stripped by Minnesota Vikings' defensive end Martail Burnett (61) during the second half of a NFL preseason football game, Friday, Aug. 21, 2009 in Minneapolis. The Vikings won 17-13. (AP Photo/Paul Battaglia)

Kansas City Chiefs' running back Jackie Battle is stopped on a one-yard dive by Minnesota Vikings' linebacker Jasper Brinkley (54) and safety Husain Abdullah (39) during the second half of a NFL preseason football game, Friday, Aug. 21, 2009 in Minneapolis. The Vikings won 17-13. (AP Photo/Paul Battaglia)

Kansas City Chiefs running back Jackie Battle, left, fumbles the ball as Minnesota Vikings defensive end Martail Burnett (61) and linebacker Erin Henderson (50) make the tackle during the third quarter of a NFL preseason football game Friday, Aug. 21, 2009 in Minneapolis. Minnesota recovered the ball.(AP Photo/Tom Olmscheid)

Minnesota Vikings head coach Brad Childress watches his team during the third quarter of a NFL preseason football game against the Kansas City Chiefs Friday, Aug. 21, 2009 in Minneapolis.(AP Photo/Tom Olmscheid)

Minnesota Vikings' quarterback Tarvaris Jackson (7) looks to pass against the Kansas City Chiefs during the first half of a NFL preseason football game, Friday, Aug. 21, 2009 in Minneapolis. (AP Photo/Paul Battaglia)

Kansas City Chiefs runningback Larry Johnson looks for running room against Minnesota Vikings in the first quarter of the NFL preseason football game, Friday, Aug. 21, 2009 in Minneapolis.(AP Photo/Andy King)

Kansas City Chiefs' quarterback Matt Cassel (7) looks to pass after he was almost tackled by Minnesota Vikings' defensive tackle Fred Evans, background, during the first half of a NFL preseason football game, Friday, Aug. 21, 2009 in Minneapolis. (AP Photo/Paul Battaglia)

Minnesota Vikings quarterback Brett Favre, left, hands off to Vikings running back Adrian Peterson during the first quarter of a NFL preseason football game against the Kansas City Chiefs, Friday, Aug. 21, 2009 in Minneapolis.(AP Photo/Andy King)

Minnesota Vikings quarterback Brett Favre looks over a play chart with Vikings offensive coordinator Darrell Bevell, right, and quarterback Sage Rosenfels, left, who did not suit-up for the game, after the Vikings first offensive series during the first quarter of a NFL preseason football game against the Kansas City Chiefs on Friday, Aug. 21, 2009 in Minneapolis.(AP Photo/Tom Olmscheid)

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.(AP Photo/Andy King)

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.(AP Photo/Andy King)

Minnesota Vikings quarterback Brett Favre warms up for a NFL preseason football game against the Kansas City Chiefs, Friday, Aug. 21, 2009 in Minneapolis.(AP Photo/Andy King)

Minnesota Vikings quarterback Brett Favre warms-up prior to an exhibition NFL football game against the Kansas City Chiefs, Friday, Aug. 21, 2009 in Minneapolis.(AP Photo/Tom Olmscheid)

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. (AP Photo/Paul Battaglia)

Minnesota Vikings fans wait for the arrival of new Minnesota Viking Quarterback Brett Favre before warm ups for a NFL preseason football game against the Kansas City Chiefs, Friday, Aug. 21, 2009 in Minneapolis.(AP Photo/Andy King)

Minnesota Vikings quarterback Brett Favre (4) follows quarterback teammate Tarvarls Jackson (7) onto the field for pre-game warm-ups prior to the Vikings NFL preseason football game against the Kansas City Chiefs Friday, Aug. 21, 2009 in Minneapolis. (AP Photo/Tom Olmscheid)

Minnesota Vikings quarterback Brett Favre warms up for a NFL preseason football game against the Kansas City Chiefs, Friday, Aug. 21, 2009 in Minneapolis.(AP Photo/Andy King)

Jared Beck, 9, of Fargo, N.D. wears a Brett Favre jersey as he waits for the Vikings quarterback to get on the field prior to a NFL preseason football game against the Kansas City Chiefs on Friday, Aug. 21, 2009 in Minneapolis. (AP Photo/Tom Olmscheid)