Turkish club Besiktas will meet Dutch team Feyenoord in Rotterdam on Wednesday. The game kicks off 21.00 local time in Turkey (17.00 GMT).
The first leg fixtures are as follows:
29 July Tuesday
20.30 Sparta Prague (Czech Republic) vs Malmo (Sweden)
21.15 Slovan Bratislava (Slovakia) vs Sheriff (Moldova)
21.30 Debrecen (Hungary) vs BATE Borisov (Belarus)
30 July Wednesday
18.00 Aktobe (Kazakhstan) vs Steaua Bucharest (Romania)
18.30 Qarabag (Azerbaijan) vs Salzburg (Austria)
19.00 HJK Helsinki (Finland) vs APOEL (Greek Cypriot Administration)
19.00 AEL Limassol (Greek Cypriot Administration) vs Zenit (Russia)
19.00 Dnipro (Ukraine) vs Copenhagen (Denmark)
20.00 Grasshoppers (Switzerland) vs Lille (France)
21.00 Standard Liege (Belgium) vs Panathinaikos (Greece)
21.00 Feyenoord (Netherlands) vs Besiktas (Turkey)
21.00 Ludogorets (Bulgaria) vs Partizan (Serbia)
21.15 Aalborg (Denmark) vs Dinamo Zagreb (Croatia)
21.30 Maribor (Slovenia) vs Maccabi Tel Aviv (Israel)
21.45 Legia Warsaw (Poland) vs Celtic (Scotland)
Kick-off times have been adjusted to local time in Turkey.