Oakland Raiders running back Darren McFadden practices at an NFL football training camp in Napa, Calif., Friday, Aug. 3, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders quarterback Carson Palmer practices at NFL football training camp in Napa, Calif., Friday, Aug. 3, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders running back Darren McFadden, right, fumbles as defensive tackle Jamie Cumbie (98) approaches at an NFL football training camp in Napa, Calif., Friday, Aug. 3, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders wide receiver Darrius Heyward-Bey practices at an NFL football training camp in Napa, Calif., Friday, Aug. 3, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders quarterback Matt Leinart throws during practices at an NFL football training camp in Napa, Calif., Friday, Aug. 3, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders running back Taiwan Jones, right, runs against defensive tackle Dominique Hamilton at an NFL football training camp in Napa, Calif., Friday, Aug. 3, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders quarterback Carson Palmer throws at an NFL football training camp in Napa, Calif., Monday, July 30, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders owner Mark Davis, left, talks with head coach Dennis Allen at an NFL football training camp in Napa, Calif., Monday, July 30, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders linebacker Rolando McClain practices at an NFL football training camp in Napa, Calif., Monday, July 30, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders quarterback Carson Palmer stretches at an NFL football training camp in Napa, Calif., Monday, July 30, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders head coach Dennis Allen watches stretching at an NFL football training camp in Napa, Calif., Monday, July 30, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders running back Darren McFadden practices at an NFL football training camp in Napa, Calif., Monday, July 30, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders running back Darren McFadden, right, practices with safety Michael Huff at an NFL football training camp in Napa, Calif., Monday, July 30, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders head coach Dennis Allen, center, watches stretching at an NFL football training camp in Napa, Calif., Monday, July 30, 2012. (AP Photo/Jeff Chiu)

Oakland Raiders head coach Dennis Allen speaks to reporters after practice at an NFL football training camp in Napa, Calif., Monday, July 30, 2012. (AP Photo/Jeff Chiu)