Arsene Wenger was bold enough to start Spain international right-back Hector Bellerin despite meeting high-flying Manchester city in the Carabao Cup final on Sunday.
Jack Wilshere also started in midfield for the Gunners who were 3-0 up going into the game after the first leg of the clash in Sweden.
The Gunners clearly underrate their opponents and they nearly pay for that in the 5th minute when the visitors Ostersunds had the first chance of the game with a shot from close range but it was blocked by Rob Holding
There was another nervous moment for the Gunners some minutes later when Nouri had the ball at his feet with only Ospina to beat but the striker surprisingly missed the target.
As if that wasn’t enough, in just eight minutes after Nouri’s miss, Ospina was forced into a fine save by Sema in the 18th minute.
After some minutes of action, Arsenal finally had a chance to pull the trigger but Wilshere’s shot didn’t threaten the visitor’s goalkeeper as it was blocked out for a corner.
In the 23rd minute, the Swedish side broke the deadlock via Aiesh who was played onside by Callum Chambers to put the scoreline at 1-0. In Just a minute later, Ostersunds FK doubled their lead after Iwobi lost the ball to an Ostersunds player who made no mistake in locating a swift run made by Sema who then stroke a powerful shot across Ospina into the far corner to make 2-0.
The Gunners finally woke up from their shocking awful display to pull one goal back through Kolasinac after a great pass from Hector Bellerin to bring the scoreline to 2-1.
Despite losing to the minnows, Arsenal qualified to the next round of the competition after a 3-2 aggregate victory over Ostersunds FK but they must improve their overall performance if they really want to win the trophy