"We were in trouble in the first half".
"They scored the second and Ignashevich had a chance to score goal three, then we were a bit on the ropes". Italians had won the first leg 4-1.
Arsenal will learn their Europa League semi-final opponents - one of Atletico Madrid, Marseille or Red Bull Salzburg - at 1pm United Kingdom time today.
But Arsenal's nerves began to jangle as CSKA took a 39th-minute lead when Nababkin's header from Konstantin Kuchaev's cross was parried by goalkeeper Petr Cech into the path of Chalov, who applied a close-range finish.
"They were very focused and played well as they attempted to score", Elneny said following the game, which saw him provide the two assists of Arsenal's two goals.
But the Gunners were given a shock after conceding two goals on either side of the half time break.
Atletico Madrid suffered a 1-0 defeat away to Sporting Lisbon, but the result was just enough to allow Diego Simeone's men to go through 2-1 on aggregate. "At 2-1 we looked good to get to 2-2 and we did".
"So, let's prepare well for the semi-final and see who we play".
Stefan Ilsanker's own goal put Marseille level on the night and the French club were ahead inside 10 minutes when a lighting counter-attack ended with Bouna Sarr firing home.
The hosts proceeded to score four times in 20 minutes to advance 6-5 on aggregate.
However, Atletico held on to progress on aggregate after their striker Antoine Griezmann missed a hatful of chances and will take their place in Friday's semi-final draw.