Minnesota Vikings Brett Favre (L) talks with back-up quarterback sTarvaris Jackson (R) and John David Booty (C #9) as they walk onto the field before their NFL football game against the Kansas City Chiefs at the Metrodome in Minneapolis, Minnesota ...

New Minnesota Vikings quarterback Brett Favre (4), looks on along with teammates Tavaris Jackson (7), and John David Booty (9) during NFL football training camp, Tuesday, Aug. 18, 2009 in Eden Prairie, Minn. (AP Photo/Hannah Foslien)

Brett Favre (4) stretches with fellow Minnesota Vikings quarterbacks John David Booty (9) and Tarvaris Jackson (7), Tuesday, August 18, 2009, in Eden Prairie, Minnesota. (David Joles/Minneapolis Star Tribune/MCT) Photo via Newscom

Minnesota Vikings quarterback Sage Rosenfels plays catch with fellow quarterback John David Booty during an evening workout in NFL football training camp Saturday, Aug. 1, 2009, in Mankato, Minn. Quarterback Tarvaris Jackson was injured during the morning workout session and ...