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Arsenal will have to get past Besiktas if they are to play in the group stage of the Champions League after being drawn against the Turkish side in the play-off round.
Meanwhile Celtic, who have been reinstated after Legia Warsaw were kicked out of the competition for fielding an ineligible player, will play the Slovenian outfit Maribor.
Besiktas finished third in the Super Lig last term, 12 points adrift of champions Fenerbahce.
They are managed by the former Croatia coach Slaven Bilic and beat Dutch side Feyenoord 5-2 on aggregate in the third qualifying round.
Meanwhile, Celtic must wait to see if Legia Warsaw win their appeal after Ronny Deila's side were handed aChampions Leaguereprieve.
The Polish side beat the Bhoys 6-1 on aggregate in the third qualifying round tie but brought on Bartosz Bereszynski in the second leg, when he was supposed to be suspended.
As a result Celtic were handed a 3-0 'walkover' win for the second leg, taking them through on away goals.
Legia official Dominik Ebebenge said: "This is unjust and completely disproportionate. There have been similar cases in the past which have not punished in this way. This was just a basic human error.
"We have spent eight years working towards this and now it has been taken away from us. Financially, it's unimaginable and the players are shattered."
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