Arsenal boss Arsene Wenger has admitted his side are not as used to winning in Europe as they are in the Premiership ahead of their trip to Rosenborg.
ARSENE WENGER'S VIEW
Rosenborg v Arsenal
Date: Weds, 29 September
Venue: Stadium Lerkendal
Kick off: 1945 BST
"What changes is the fact we don't have the same certainty or belief in the Champions League that we do in the domestic competition," said Wenger.
"Even though, I do think it is harder to win the domestic competition.
"We know we have done it in England and we know we can do it again. In Europe we haven't, but it will come."
Wenger is keen for Arsenal to just get through Group E with the minimum of fuss and qualify for the knockout stage.
He added: "It is important just to qualify. The message we send out to other team is not so important.
"It was so close last season that this season it will be a big relief to go through.
"If we get the points away from home in one of these next two games against Rosenborg or Panathinaikos then it will put us in a good position.
"It is a group where anybody can beat anybody."