:NASHVILLE, TN - SEPTEMBER 03: Adrian Peterson #28 of the Minnesota Vikings looks on during a NFL pre-season game against the Tennessee Titans at Nissan Stadium on September 3, 2015 in Nashville, Tennessee. (Photo by Ronald C. Modra/Getty Images)
:NASHVILLE, TN - SEPTEMBER 03: Adrian Peterson #28 of the Minnesota Vikings looks on during a NFL pre-season game against the Tennessee Titans at Nissan Stadium on September 3, 2015 in Nashville, Tennessee. (Photo by Ronald C. Modra/Getty Images)