Europa League 20222: Saka struck midway through the first half to give the Gunners their third win in all Group A outings in Norway.
“I’m really happy to win against a team that has won the last 14 games here at home,” Arsenal coach Mikel Arteta said.
“We were expecting a really tough night here and we made changes, but I’m excited to find a way to win.”
Arsenal are two points ahead of PSV Eindhoven, who beat FC Zurich 5-0. Four points from four games for Bodo/Glimt.
Scott McTominay saved United’s blushes in the 93rd minute in a 1-0 win over Cypriot Omonia at Old Trafford.
The Scotland midfielder thwarted United’s hopes of a sloppy finish as Omonia goalkeeper Francis Uzoho pulled off a string of fine saves in stoppage time.
“You have to be patient sometimes. Their goalkeeper was in a different class but we created enough chances and finally scored,” McTominay told BT Sport.
“It’s a huge goal to win our group.”
Erik ten Haag’s side remain three points behind Group E leaders Real Sociedad, who beat 10-man Sheriff Tiraspol 3-0 to maintain their fourth straight winning streak.
La Real can go ahead. Which team goes directly to the last 16 will be confirmed by a clash with United on 3 November.
Each of the eight group runners-up will face a team that was eliminated from the Champions League in the knockout round play-offs in February.
Bettis lost perfect record
Real Betis dropped their first point of the competition in a 1-1 draw with Roma in Group C. Because they missed the chance to secure a place in the last sixteen.
Sergio Canales put Betis ahead in the 34th minute but Andrea Bellotti equalized for Roma, who finished third behind Ludogorets. The Bulgarians won 2-0 at home to HJK Helsinki.
Freiburg inflicted further misery on Nantes with a 4-0 win at the French Cup holders, with their fourth successive win in Group G.
Both Fenerbahce and Rennes have confirmed they will advance from Group B. Fenerbahce won 2-1 in AEK Larnaca, while Rennes beat Dynamo Kyiv 1-0 in Krakow.
Belgium’s Union Saint-Gilois, who fell to two goals in a thrilling 3-3 draw against Braga and secured a place in the last 16, will have to wait.
Union Berlin kept their hopes alive in Group D as Robin Knoch’s 89th-minute penalty stunned Bundesliga leaders Malmö 1-0.
All four teams in Group F are on five points. Lazio drew 2-2 at home to Storm Graz and trailed Feyenoord on the same scoreline away to Midtjylland.
Ferencvars lead Group H by three points after beating Red Star Belgrade 2-1. Trabzonspor beat Monaco 4-0 to move up from Ligue 1 to second place.
Villarreal qualified as winners of the Europa Conference League last 16 Group C in the game. Senegalese midfielder Nicolas Jackson scored the goal in their 1-0 win at Austria Vienna.
West Ham progressed from Group B with a 2-1 win at Anderlecht thanks to goals from Said Benrahma and Jarrod Bowen.
The Hammers, desperate to grab top spot, need a point from their last two matches.
Istanbul Basaksehir and Djurgården will also begin their European adventures in the new year.