An undrafted free agent in 2016, Foster made three appearances as a rookie with the Patriots, but the backfield was too stacked for him to make their 53-man roster after last preseason. He instead spent Week 1 on New England's practice squad, from which he was plucked by Arizona on the heels of David Johnson's dislocated wrist in the opener. Foster needed time to ingratiate himself with coach Bruce Arians and company, but another season-ending injury to Adrian Peterson forced the Cardinals' hand. From Week 11 onward, Foster was a receiving complement to starter Kerwynn Williams, reeling in 17 of 28 passes for 133 yards over the final seven games. With Johnson back to handle a workhorse role and the selection of fourth-rounder Chase Edmonds, Foster may be a healthy scratch weekly, assuming he lands a spot on the final squad.