Arsenal survived a hostile atmosphere and the sending-off of Aaron Ramsey to leave Istanbul with what could prove a priceless draw
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Athletic Bilbao will have the upper hand back at San Mames after holding Napoli to a 1-1 Champions League play-off draw on Tuesday night.
The Primera Division and Serie A giants were pitted against each other in a battle to reach the group stages and Athletic took the initiative with Iker Muniain scoring four minutes before the break in Naples.
Napoli hit back after the interval as former Real Madrid striker Gonzalo Higuain fired a leveller on 68 minutes but the Basque outfit will fancy their chances of winning the second leg and progressing to the next stage.
There were five goals in the first half of action in the Danish capital as Bayer Leverkusen claimed a 3-2 win at FC Copenhagen.
Stefan Kiessling (five) and Zanka (nine) exchanged goals before Daniel Amartey nudged FCK ahead in the 13th minute.
Bayer equalised through Karim Bellarabi on 31 minutes and, three minutes before the break, Son Heung-min grabbed what proved to be the winner for the Bundesliga giants.
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Celtic will compete in the Champions League play-offs after the Court of Arbitration for Sport rejected Legia Warsaw's bid to be provisionally reinstated.
Legia took their case to the Swiss-based court after their punishment for fielding an ineligible player was rejected by UEFA's appeal body on Thursday.
But CAS confirmed on Monday afternoon that it had denied Legia's initial request and that Celtic will play Maribor in Slovenia on Wednesday night.