INDIANAPOLIS, IN - MARCH 03: Running back Christian McCaffrey of Stanford runs the 40-yard dash during the NFL Combine at Lucas Oil Stadium on March 3, 2017 in Indianapolis, Indiana. (Photo by Joe Robbins/Getty Images)

INDIANAPOLIS, IN - MARCH 03: Running back Christian McCaffrey of Stanford runs the 40-yard dash during the NFL Combine at Lucas Oil Stadium on March 3, 2017 in Indianapolis, Indiana. (Photo by Joe Robbins/Getty Images)