Arsenal goalkeeper Alex Runarsson knows he'll need to up his concentration levels with the Gunners.

Runarsson, signed from Dijon in the summer as back-up to Bernd Leno, had to wait until the visit of Dundalk to make his bow.

The 25-year-old conceded 59 goals in 34 Ligue 1 starts for his former club, keeping just five clean sheets in the process.

But he faced only one shot on target during the Dundalk win and, while he may have more difficult tests to come in his Arsenal future, Runarsson knows he will need to maintain his concentration levels for when he is called upon.

"I think that is normal playing for a club like Arsenal," he said when asked if he needs to stay alert when he is not busy.

"We have the ball a lot and there are going to be a lot of games like this.

"But you have to be alert for maybe the one or two chances and I was a little lucky it came at the beginning of the game, it gave me a good start.

"But I think this is going to be the image of a lot of games for Arsenal.

"I'm proud to have reached this achievement (making his debut) and I'm proud of the team that we got a very good win. All games in Europe are difficult so it is a very good result."