Mikel Arteta has identified what Arsenal's problem is after yet another defensive mishap - and it is not because they play out the back.
The Gunners beat Olympiacos 3-1 in their first leg encounter after goals from Marton Odegaard, Gabriel Magalhaes and Mohamed Elneny.
It means they will return for the second leg in good condition with three away goals.
But it was not a perfect evening for Arsenal on Thursday night - with yet another defensive howler.
Bernd Leno played the ball into Dani Ceballos, who lost possession amid a high press from the Greeks.
With the goalkeeper out of position, Youssef El-Arabi scored to equalise for the Super League champions.
Arsenal went on to win the contest but it was another incident of poor defensive work.
It follows a similar moment against Burnley where Granit Xhaka recieved the ball from the goalkeeper.
And as he went to clear the danger as the Clarets closed in, the Swiss international smashed the ball against Chris Wood and then into the net.
However, Arteta has insisted the problems do not start with the fact they are playing out from the back.
Instead, he has pinpointed the blame on the other players for not being in the right positions to help alleviate the trouble.
He said: "It's not concentration it's about when you play the ball. It is not about the structure or the decision making it's about when you play the ball.
"It's not about stopping the way we play because this is us and we get a lot of reward.
"It's about identifying when we do it and how we do it.
"Training it when we have more time which we don't because we play every three days. And keep consistent.
"But the worst thing we can do is get the structure to play and then don't be willing and have fear to play. It's better to play long then."
