Arsenal goalkeeper Bernd Leno felt his team was lucky to go past Olympiacos in the Europa League.

The Gunners had won the away leg 3-1 last week, but lost 1-0 at home to the Greek outfit.

The result meant they progressed 3-2 on aggregate.

Leno, however, felt if they played in such a manner in future games, they would not have much success.

"I think we suffered today and it was not necessary," Leno told the club's website.

"I think because in the first 15 or 20 minutes we controlled the game but then we've made too many easy mistakes and in the second half we conceded the goal and then everybody was nervous.

"We made it hard for ourselves and, like I said, it was not necessary.

"In the dressing room it was quiet because everybody knows that it was not a good performance from us. We cannot change it anymore but the positive thing is that it was a warning.

"We need to be 100 per cent every game. If we play like today then we won't reach anything this season.

"I think there are only very good teams in the quarter-finals and we need two perfect games to go to the semi-finals and two more games to go to the final."