Martin Odegaard says Arsenal showed their 'spirit' in the 3-1 win over Olympiacos on Thursday.
The Greek hosts scored early in the second-half to cancel out Odegaard's stunning opener.
But it did not stop Mikel Arteta's side from powering on, as Gabriel and Mohamed Elneny fired them to victory.
Speaking to BT Sport, Odegaard said: "It is a big win for us, a great result with three goals away from home and win in this competition is always good.
"The mentality in this team is great. Very pleased with everything. We showed the spirit in the team and the way we back each other. If one player makes a mistake then we react. That is what it is about, being a team. When one player makes a mistake you have to strike back as a team.
"It is just half time. We have to keep going. We have a big game on Saturday and then have to be ready for next Thursday. It is very important, we are not where we want to be in the league so this is very important for us and a chance to get Champions League football next year."
On his goal, Odegaard added: "I wanted to get a shot on goal, luckily I had a good hit and it went in. I have felt at home since the first day, I am happy to be here and feel great.
