Arsenal set Turkish test, reprieved Celtic face Maribor
Arsenal players Calum Chambers (L), Mathieu Debuchy (C) and Olivier Giroud (R) warm up during a training session at the Emirates stadium in north London, on August 7, 2014 - by Leon Neal
There was drama minutes before Friday's draw in Nyon when Polish club Legia Warsaw, who had dished out a 6-1 third qualifying mauling to Celtic, were ruled out.
Legia were demoted to the Europa League play-offs for fielding an ineligible player - Bartosz Bereszynski.
Last season Celtic failed to make it out of the group stage.
Arsenal must over overcome Besiktas to seal their 17th consecutive appearance in the Champions League group stages.
"what a draw! already looking forward to the matches against @Besiktas! #Turkey #Istanbul #Arsenal #AFC #UCLdraw" tweeted Arsenal's Germany midfielder Mesut Ozil.
Last season the Gunners saw off another Turkish club, Fenerbahce, to go on to make it into the Last 16 where Arsene Wenger's 2006 finalists came a cropper against Bayern Munich.
This is the north London giant's first meeting with the Istanbul club, who finished third in the Turkish Super League last term and who count former Gunner Oguzhan Ozyakup in their midst.
Besiktas are managed by former West Ham and Everton defender, Slaven Bilic.
Other match-ups include Lille against 2004 European champions FC Porto, Napoli facing Athletic Bilbao, Bayer Leverkusen playing FC Copenhagen, and the Andre Villas-Boas-coached Zenit St Petersburg meeting Standard Liege.
The first leg ties are scheduled for August 19/20, with the second leg matches on August 26/27.
The ten winners will join the 22 teams automatically qualified for the group stage, which gets underway in September.
In the Europea League play-off draw held later, Arsenal's Premier League rivals Tottenham and Hull were drawn against Limassol of Cyprus and Beglium's Lokeren respectively.
Ties are due to be held on August 21/28.