FK Austria Wien v GNK Dinamo Zagreb (2-0)
• The Vienna club have not surrendered a two-goal lead in Europe for more than 50 years. The only time they let slip such a winning position was in the 1960/61 European Cup Winners' Cup quarter-finals when they beat Wolverhampton Wanderers FC 2-0 at home but lost 5-0 in England.
• Dinamo's biggest comeback came en route to winning the 1966/67 Inter-Cities Fairs Cup when they lost their semi-final first leg 3-0 at Eintracht Frankfurt but triumphed 4-0 in the return.
FC Basel 1893 v PFC Ludogorets Razgrad (4-2)
• Basel are unbeaten in seven home matches in Europe, including a 1-0 success against Maccabi Tel-Aviv FC in the third qualifying round. The Swiss club have won eight of the nine European ties in which they gained a two-goal advantage in the first leg.
• Bulgarian champions Ludogorets had only ever played one European tie before this season – losing to a Dinamo Zagreb strike eight minutes into added time in last season's second qualifying round just as an away-goals triumph beckoned.
Legia Warszawa v FC Steaua Bucureşti (1-1)
• Legia are hoping to make it third time lucky after twice losing in the final round of qualifying, against FC Barcelona in 2002/03 and FC Shakhtar Donetsk in 2006/07.
• Overall, Steaua have lost six of the ten UEFA competition ties in which they drew the first leg at home.
PAOK FC v FC Schalke 04 (1-1)
• PAOK's two previous encounters with German opponents both went to penalty shoot-outs. In the 1983/84 UEFA Cup second round against FC Bayern München, Pál Csernai's PAOK side drew 0-0 at home and earned a second stalemate in Munich before losing the tie 9-8 on penalties.
• Schalke were unbeaten in their four away matches in the 2012/13 UEFA Champions League, a run that included a 2-1 victory over Olympiacos FC in Greece with Benedikt Höwedes and Klaas-Jan Huntelaar scoring.
Arsenal FC v Fenerbahçe SK (3-0)
• To qualify for the group stage Fenerbahçe SK must become only the third continental opponents in 50 years to inflict on Arsenal a home defeat of three goals or more – a massive task for a team who have only scored a combined three goals on eight previous trips to England.
• Although Arsenal lost twice at home by two goals in last season's UEFA Champions League – 2-0 against FC Schalke 04 in the group stage and 3-1 against Bayern in the round of 16 – only twice in their entire European history have they suffered a defeat of the kind Fenerbahçe need. Those two heavy losses came against FC Internazionale Milano (0-3) in the 2003/04 UEFA Champions League group stage and FC Spartak Moskva (2-5) in the 1982/83 UEFA Cup first round.
FC Zenit v FC Paços de Ferreira (4-1)
• Before losing to AC Milan in the 2012/13 group stage, Zenit had gone 16 games unbeaten at home in UEFA competition. Including their 5-0 defeat of FC Nordsjælland in the third qualifying round they have won three of their last four home outings in Europe, and have lost just one of their last 22.
• Paços, competing in the UEFA Champions League for the first time, have never before scored an away goal in European competition.
AC Milan v PSV Eindhoven (1-1)
• This is the only tie of the play-off round that pits together two former European champions – PSV lifted the trophy in 1988 while Milan are seven-time winners.
• Milan lost 2-0 to AFC Ajax in their last home meeting with an Eredivisie side, in the 2010/11 group stage, albeit with progress to the last 16 already assured. Their overall record against Dutch clubs at San Siro is W6 D1 L3.
NK Maribor v FC Viktoria Plzeň (1-3)
• Plzeň have never let a two-goal lead slip in Europe and will arrive in Maribor confident of finishing the job given their free-scoring form in qualifying and a run of six games unbeaten on their travels in UEFA competition.
• Maribor have twice gone into a European home tie with a two-goal first-leg deficit and ended up eliminated on each occasion – against FC Zimbru Chisinau in the 2000/01 UEFA Champions League second qualifying round (0-2 a, 1-0 h) and Olympiacos in the 1995/96 UEFA Cup first round (0-2 a, 1-3 h).
Celtic FC v FC Shakhter Karagandy (0-2)
• Celtic can take heart from the fact that four times previously they have returned to Glasgow with a 2-0 first-leg deficit to overcome in UEFA competition – and three times they have pulled off a successful fightback.
• Whatever the outcome, Shakhter can look forward to a historic first European group stage appearance for a Kazakh club, given that the losing side will advance to the equivalent phase of the UEFA Europa League.
Real Sociedad de Fútbol v Olympique Lyonnais (2-0)
• Lyon must do something they have never achieved before and overturn a first-leg home defeat if they are to reach the group stage. Twice before they have been in this position – against Maribor in the 1999/2000 UEFA Champions League third qualifying round (h 0-1, a 0-2) and against Trabzonspor in the 1991/92 UEFA Cup second round (3-4 h, 1-4 a).
• Real's last home victory in continental competition was in September 2003, when Darko Kovačević earned them a 1-0 success against Olympiacos in the UEFA Champions League group stage.
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