Mitchell was elevated from the Vikings' practice squad ahead of Monday's game against the Bears.
Since Adam Thielen (ankle) is a game-time decision while Dede Westbrook (illness) and Dan Chisena (undisclosed) are on the reserve/COVID-19 list ahead of Monday's contest, Mitchell will join the active roster to provide additional depth at wide receiver. The undrafted rookie hasn't yet made his regular-season debut in the NFL.