The 19-year-old joined the action in extra time, just minutes after Robin Quaison had broken the deadlock for the home side.
And despite only playing five minutes, Elanga quickly showed glimpses of the blistering pace and fearless running that has so endeared him to the United supporters, as the hosts saw the game out and progressed to the play-off final.
Sweden now face a trip to Poland on Tuesday to determine who will earn a place in Qatar for the winter competition from Path B, while Elanga’s club teammates Cristiano Ronaldo, Bruno Fernandes and Diogo Dalot host North Macedonia in the Path C final.