Fans chant for Minnesota Vikings running back Adrian Peterson as Peterson reports to an NFL football training camp Saturday, July 25, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Young Minnesota Vikings' fans watch for the next player to report to an NFL football training camp on the campus of Minnesota State University Saturday, July 25, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Young Minnesota Vikings' fans watch for the next player to report to an NFL football training camp on the campus of Minnesota State University Saturday, July 25, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings running back Adrian Peterson signs autograph as he reports to an NFL football training camp at Minnesota State University Saturday, July 25, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings outside linebacker Anthony Barr signs autographs as he reports to an NFL football training camp on the campus of Minnesota State University Saturday, July 25, 2015, in Mankato, Minn. (AP Photo/Charles Rex Arbogast)

The Minnesota Vikings first-round draft pick, cornerback Trae Waynes, signs autographs after he reported to an NFL football training camp on the campus of Minnesota State University, Saturday, July 25, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings wide receiver Cordarrelle Patterson signs autographs after reporting to an NFL football training camp on the campus of Minnesota State University Saturday, July 25, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings outside linebacker Anthony Barr signs autographs as he reports to an NFL football training camp on the campus of Minnesota State University Saturday, July 25, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings tackle Matt Kalil signs autographs as he reports to an NFL football training camp on the campus of Minnesota State University Saturday, July 25, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings quarterback Teddy Bridgewater signs autographs as he reports to an NFL football training camp at Minnesota State University Saturday, July 25, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings tackle Phil Loadholt rides a bicycle to practice at an NFL football training camp on the campus of Minnesota State University, Sunday, July 26, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings head coach Mike Zimmer smiles during practice at an NFL football training camp on the campus of Minnesota State University, Sunday, July 26, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings players, clockwise from top left, Kyle Rudolph, Charles Johnson, Zach Line and Adrian Peterson listen as quarterback Teddy Bridgewater (5) calls a play during practice at an NFL football training camp on the campus of Minnesota State University, Sunday, July 26, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings quarterback Teddy Bridgewater warms up before practice at an NFL football training camp on the campus of Minnesota State University, Sunday, July 26, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings quarterback Teddy Bridgewater, left, fakes a handoff to running back Adrian Peterson during practice at an NFL football training camp on the campus of Minnesota State University, Sunday, July 26, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings head coach Mike Zimmer, left, talks to wide receiver Mike Wallace (11) during practice at an NFL football training camp on the campus of Minnesota State University Sunday, July 26, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings running back Adrian Peterson carries the ball during practice at an NFL football training camp on the campus of Minnesota State University ,Sunday, July 26, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)

Minnesota Vikings quarterback Teddy Bridgewater warms up before practice at an NFL football training camp on the campus of Minnesota State University, Sunday, July 26, 2015, in Mankato, Minn. (Charles Rex Arbogast/Associated Press)