Moi Elyounoussi's Norway secured a second win of their UEFA Nations League campaign, narrowly edging out Slovenia 1-0 in Oslo, while Shane Long was involved in a 0-0 stalemate with Denmark.
AS Saint-Étienne midfielder Ole Kristian Selnaes netted the only goal of the game in first-half stoppage time for Norway, where Saints' wideman played the majority of the tie - replaced in the 93rd minute by Martin Linnes.
With Bulgaria also winning, Norway's six points means they sit second in their respective group standings, three points shy of the front runners.
Long, a starter for Martin O'Neill's Republic of Ireland, played out a 0-0 with their Scandinavian opposition - where colleagues Jannik Vestergaard and Pierre-Emile Højbjerg were unused substitutes.
The striker played 83 minutes of the clash, hosted in Dublin, as Ireland picked up their first UEFA Nations League point.