Beşiktaş and Porto both have designs on the round of 16 as they meet in Istanbul, although the Turkish side lead the way in Group G and won in Portugal on matchday one.
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Beşiktaş JK are closing in on the round of 16 and have the chance to wrap up both qualification and first place in Group G against an FC Porto team who are also within sight of progress.
• Beşiktaş, who were 3-1 winners in Portugal on matchday one, have ten points, four above their second-placed oppponents. They are through, and would clinch first place, with a draw. Even if they lose, they are through if third-placed RB Leipzig do not win away to bottom side AS Monaco FC.
• Porto are through if they win and Leipzig do not.
• These clubs first met in the 2007/08 group stage, Porto winning both fixtures. The Dragons prevailed 1-0 in Istanbul and 2-0 in Porto, and Ricardo Quaresma – now of Beşiktaş – scored in each game.
• Porto also won at Beşiktaş in the 2010/11 UEFA Europa League group stage, their 3-1 victory in Istanbul earned by Radamel Falcao and two-goal Hulk despite Porto ending with nine men after red cards for Maicon (43) and Fernando (89). Bobô scored an added-time consolation for the hosts.
• The line-ups at the BJK İnönü Stadyumu on 21 October 2010 were:
Beşiktaş: Hakan Arıkan, Ernst, Hilbert, Mert Nobre (Ersan Gülüm 83), Rodrigo Tabata, Necip Uysal, İbrahim Üzülmez (İsmail Köybaşı 78), Zápotočný (Ali Küçik 71), İbrahim Toraman, Bobô, Nihat.
Porto: Helton, Maicon, Pereira, Fernando, Rolando, Săpunaru, Belluschi, Cristian Rodríguez (Varela 75), Moutinho (Guarín 81), Falcao (Otamendi 46), Hulk.
• The Turkish team avoided defeat against Porto for the first time in their last encounter before this season, a 1-1 draw in that same group stage. Falcao was again on target for Porto, via a 36th-minute penalty, but Nihat Kahveci struck on 62 minutes to give Beşiktaş a point. Both sides had a man sent off, with Porto's Cristian Rodríguez (59 minutes) and İbrahim Toraman (67) of Beşiktaş dismissed for two yellow cards.
• The Turkish team have never won at home to Portuguese opposition, with the record D2 L3. Beaten 1-0 by SC Braga in the 2011/12 UEFA Europa League round of 32 second leg (2-1 aggregate), Beşiktaş drew 1-1 with Sporting Clube de Portugal in the 2015/16 group stage and 3-3 against SL Benfica in last season's UEFA Champions League. when they had trailed 3-0.
• Coupled with their two defeats by Porto, that gives Beşiktaş the record W0 D2 L3 against visitors from Portugal in Istanbul. Victory at Porto on matchday one this season was their third against Portuguese clubs (D4 L5).
• The Turkish side had their four-match winning streak at home in Europe halted by the 1-1 draw with Monaco last time out having beaten Leipzig 2-0 on matchday two. They are unbeaten in their last 11 matches in Istanbul (W5 D6) since a 3-1 loss to Club Brugge KV in the 2014/15 UEFA Europa League round of 16. That is the sole reverse in their last 19 European home games (W10 D8).
• Beşiktaş drew all three home games in last season's group stage, and have drawn five of their last six fixtures in the UEFA Champions League, qualifying included. The defeat of Leipzig and the 3-1 third qualifying round win against Feyenoord in August 2014 are their only home victories in their last ten matches in this competition (D5 L3), again including qualifying – although they are unbeaten in their last seven such fixtures in Istanbul.
• In 2016/17 Beşiktaş finished third in their group and moved into the UEFA Europa League, where they got as far as the quarter-finals before losing on penalties to Olympique Lyonnais.
• Porto suffered their first defeat against Turkish opponents in losing to Beşiktaş on matchday one. Their record is now W6 D2 L1.
• The Portuguese side have won on their last three visits to Turkey, failing to record a victory only on their first trip – a 2-2 draw at Denizlispor in the fourth round second leg of their victorious 2002/03 UEFA Cup campaign (8-3 aggregate).
• In the middle of their wins at Beşiktaş in 2007 and 2010, Porto were 2-1 victors across Istanbul, at Fenerbahçe SK in the 2008/09 UEFA Champions League group stage.
• This is Porto's seventh successive group stage campaign and their record-equalling 22nd in total. In 2016/17 they reached the round of 16, bowing out against eventual runners-up Juventus (0-2 home, 0-1 away).
• Porto had lost their previous three UEFA Champions League fixtures, home and away, before winning at Monaco.
• Porto took four points away from home in last year's group stage.
• Last season was the third time in the last six campaigns that Porto have progressed from their group.
Coach and player links
• Vincent Aboubakar spent 2016/17 on loan at Beşiktaş, scoring 12 goals in 27 league outings and adding six more in Europe.
• Pepe was a Porto player from 2004 to 2007, winning two Liga championships; he registered six goals in 64 Liga games. He was also at CS Marítimo from 2001 to 2004.
• Quaresma was at Porto from 2004 to 2008, and again between 2013 and 2015, scoring 34 league goals in 155 appearances. He landed league titles in 2006, 2007 and 2008. Quaresma's Porto team-mates included Diego Reyes, Héctor Herrera and Ricardo Pereira (all 2013–15), Hernâni, Iván Marcao, Óliver Torres and Aboubakar (all 2014/15).
• Quaresma was also at Sporting from 2001 to 2003, playing in their 2001/02 championship-winning team.
• Porto coach Sérgio Conceição was in the Portugal side that beat Turkey 2-0 in the UEFA EURO 2000 quarter-finals. His 55th and penultimate cap came in a 4-0 friendly win against Bolivia on 10 June 2003 – a match in which half-time substitute Quaresma made his international debut.
• Have played together:
Pepe & Iker Casillas (Real Madrid CF, 2007–15)
Talisca & Maxi Pereira (Benfica, 2014–16)
Gary Medel & Alex Telles (FC Internazionale Milano, 2015/16)
• International team-mates:
Álvaro Negredo & Iker Casillas (Spain)
Pepe, Ricardo Quaresma & Ricardo Pereira, André André, Danilo Pereira (Portugal)
• Alex Telles was in the Galatasaray AŞ team that won the Turkish league and cup in 2014/15, having also lifted the cup the previous year. He made 39 league outings for the club from 2013 to 2015, scoring twice.
• Talisca claimed two consecutive doubles with Benfica in 2014/15 and 2015/16; he managed 12 goals in 53 league matches.
• Tolgay Arslan and Caner Erkin are both a booking away from a ban.
• The Black Eagles are 19 matches unbeaten at home in all competitions (W13 D6), drawing the last four.
• Beşiktaş are unbeaten in 33 home matches in the Turkish Super League, a run stretching back to November 2015.
• Şenol Güneş's side had registered in each of their last 27 games in all competitions before drawing 0-0 at home to Akhisar Belediyespor on Friday, Quaresma failing to convert an 11th-minute penalty.
• Beşiktaş ended a run of six league matches without a clean sheet in that draw with Akhisar.
• Pepe had played every minute of Beşiktaş's league campaign before suffering a foot injury on international duty playing for Portugal against the United States. He then missed the game against Akhisar.
• Ryan Babel created the only goal for Memphis Depay as the Netherlands won 1-0 in Scotland on 9 November, then scored one five days later in a 3-0 triumph in Romania.
• Mustafa Pektemek scored the only goal as Beşiktaş drew 1-1 with Romanian side FC Astra Giurgiu in a friendly on 11 November.
• Caner Erkin is currently serving a six-match domestic ban, due to run until 17 December.
• Sérgio Oliviera and Danilo Pereira are both a booking away from a ban.
• Porto have won ten out of 11 matches in the Portuguese Liga this season.
• Porto have lost just once in their last 12 matches in all competitions (W9 D2) since going down to Beşiktaş on matchday one.
• Vincent Aboubakar and Yacine Brahimi struck in added time to give Porto a 3-2 win at home to Portimonense SC in the Portuguese Cup on Friday; they were losing 2-1 going into added time.
• Aboubakar (15) and Moussa Marega (8) have contributed nearly half Porto's 48 goals in all competitions this season.
• Brahimi is the only player to feature in all 18 matches in all competitions for Porto this season.
• Diogo Dalot, 18, made his debut for Portugal U21s on 10 November in a 1-1 draw against Romania in UEFA European Under-21 Championship qualification.
• Brahimi scored three goals in two outings for Algeria during the international break, earning a 1-1 draw against Nigeria on 10 November to end an unsuccessful FIFA World Cup qualifying campaign, then contributing to a 3-0 friendly victory over Central African Republic four days later.
• Ricardo Pereira returned to the Portugal side after two years out of the reckoning, winning his third cap in the 3-0 friendly win against Saudi Arabia on 10 November.