Tottenham closed in on a place in the Europa League final after Brennan Johnson struck just 38 seconds into their 3-1 win against Norwegian side Bodo/Glimt on Thursday.
Johnson's quick-fire opener was followed by James Maddison's strike before the interval in the semi-final first leg at the Tottenham Hotspur Stadium.
Dominic Solanke's second-half penalty should have been the end of the tie.
But a late goal from Ulrik Saltnes ensured the second leg on May 8 will be a nervous occasion for beleaguered Tottenham boss Ange Postecoglou.
Postecoglou will also have to sweat on the fitness of Solanke and Maddison after both limped off with injuries.