Graham Potter admits his Ostersunds side need to pull off one of the biggest upsets in history to beat Arsenal and seal a place in the last 16 of the Europa League.
Ostersunds, a club formed a month after Arsene Wenger was appointed Arsenal boss in 1996, travel to the Emirates Stadium after losing the first leg 3-0 in Sweden last week.
The Gunners are all but assured of a safe passage into Friday's draw as they welcome a team who were in the fourth tier of Swedish football when Potter took over in 2011.