Porto will finish first in Group D regardless of the result in Istanbul, with Galatasaray chasing third place.
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With Porto already through as Group D winners, the matchday six attention in Istanbul will focus on whether Galatasaray, on a run of four games without a goal, can rescue their European campaign by claiming a place in the UEFA Europa League.
• The Portuguese side have 13 points – three of them coming from a 1-0 home win against Gala on matchday two, Moussa Marega scoring the only goal – five clear of second-placed Schalke, who are also through. Galatasaray are third on four points, one ahead Lokomotiv Moskva
• Galatasaray will finish third if they win or if Lokomotiv do not gain victory at Schalke.
• After opening with an impressive 3-0 home win against Lokomotiv, the Turkish side have picked up only one point from their last four games – from their other home game, a 0-0 draw with Schalke on matchday three. Gala have lost all three away games, failing to score at Porto, Schalke (0-2) and, last time out, Lokomotiv (0-2).
• The win against Loko ended a run of three successive home 1-1 draws in Europe for Galatasaray, who have nevertheless won only two of their last 11 continental fixtures in Istanbul, drawing six.
• Turkish champions in 2017/18, Galatasaray last reached the UEFA Champions League round of 16 in 2013/14.
• Galatasaray are in the group stage for the 15th time – the same number as all other Turkish teams combined.
• The Istanbul club's 2017/18 European campaign lasted only one tie – they lost 3-1 on aggregate to Swedish club Östersund in the UEFA Europa League second qualifying round.
• Galatasaray have won three and lost three of their six games against Portuguese clubs. At home, they were 2-1 winners against Benfica in the most recent fixture, in the 2015/16 UEFA Champions League group stage, but lost the other such game 2-0 to Braga at the same stage of the 2012/13 competition.
• Galatasaray are the only team from Turkey to have reached a European Cup semi-final, in 1989.
• After being held 1-1 at Schalke on matchday one, Porto have won their last four fixtures, following the win against Galatasaray by beating Lokomotiv in Russia (3-1) and Portugal (4-1). They wrapped up first place with a 3-1 win against Schalke on matchday five, Marega finding the net for the fourth successive UEFA Champions League match.
• The Dragons' run of four straight wins is the longest current sequence in the competition and equals the club's previous best, set in the 1996/97 group stage.
• Porto are in the UEFA Champions League for the 23rd season – the joint highest total ever alongside Real Madrid and Barcelona.
• Porto have now reached the round of 16 for three years in a row, and have qualified from the group four times in the last five seasons. In 2017/18 they lost 5-0 on aggregate to eventual runners-up Liverpool in the last 16 having been beaten at home by the same scoreline in the first leg.
• Porto picked up six points at home in last season's group stage, although their first home game was a 3-1 loss against Galatasaray's local rivals Beşiktaş. That was Porto's first defeat against a Turkish club; their record in 11 such fixtures is now W7 D3 L1, the away game against Beşiktaş having finished 1-1.
• Porto have won only two of their last eight European away games (D4 L2). They had drawn three in a row before winning at Lokomotiv.
Links and trivia
• Iker Casillas has now appeared in 20 UEFA Champions League campaigns, a competition record.
• Maicon was a Porto player between 2009 and 2016, scoring 13 goals in 190 matches; part of the victorious 2010/11 UEFA Europa League team, he also won three Portuguese Liga titles, two Portuguese Cups, and four domestic Super Cups with the Dragons.
• Alex Telles joined Galatasaray in summer 2013, scoring two goals in 60 appearances over two years.
• Fernando joined Porto in 2007, spending 2007/08 with Estrela da Amadora before six seasons in the Porto side, scoring six times in 236 appearances. A 2010/11 UEFA Europa League winner with the Dragons, his trophy haul in Portugal also included four league titles, three Portuguese Cups and five Super Cups.
• Has also played in Portugal:
Garry Rodrigues (Real Massama 2007–09)
• Have also played in Turkey:
Fabiano (Fenerbahçe 2015–17)
Vincent Aboubakar (Beşiktaş 2016/17)
• Fabiano's sole appearance against Galatasaray with Fenerbahçe was a 1-0 defeat in the 2016 Turkish Cup final.
• Have played together:
Yuto Nagatomo & Alex Telles (Internazionale Milano 2015/16)
• International team-mates:
Fernando Muslera & Maxi Pereira (Uruguay)
Sofiane Feghouli & Yacine Brahimi (Algeria)
Henry Onyekuru & Chidozie Awaziem (Nigeria)
• Cimbon have won only two of their last 11 matches in all competitions (D5 L4), drawing 2-2 at home to Rizespor on Saturday after leading 2-0. Garry Rodrigues opened the scoring with his first goal since matchday one, Eren Derdiyok finding the net for the first time since 19 October to double the advantage.
• The Istanbul club have kept only one clean sheet in their last nine fixtures.
• Galatasaray were 2-1 winners away to third division Keçiörengücü in the first leg of their Turkish Cup last-32 tie on 5 December, five members of the club's youth team starting the game.
• Galatasaray were beaten 1-0 at Istanbul rivals Beşiktaş on 2 December.
• Gala are unbeaten in 27 home matches in the Turkish Super League (W22 D5), since a 3-1 defeat by Kasımpaşa on 6 May 2017. They have drawn their last four, however, their longest run without a home league win since March-April 2011.
• Galatasaray's run of 16 successive league wins at Ali Sami Yen Spor Kompleksi in the league came to an end when they drew 1-1 against Bursaspor on 19 October.
• Overall, 18 of Galatasaray's 25 Süper Lig goals this term have been scored at home.
• Only nine of Galatasaray's 31 goals in all competitions this season have come in the first half.
• Younès Belhanda has been out since suffering a right thigh injury in Morocco's CAF Africa Cup of Nations qualifier against Cameroon on 16 November.
• Sinan Gümüş is likely to be out until the end of the year after suffering a thigh injury in his right leg in training.
• Emre Akbaba was replaced in the 32nd minute against Erzurumspor on 28 September, tests subsequently revealing a broken metatarsal in his left foot that required surgery. He has not played since.
• Porto have won their last 11 matches in all competitions, scoring 32 goals and conceding only six. They beat Portimonense 4-1 on Friday.
• The Dragons have won 14 of their last 15 matches, the exception a 1-0 loss at Benfica on 7 October, their only away defeat of the season so far.
• Porto have won six of their eight away games so far in 2018/19 (D1 L1) and have won 18 of the 22 matches so far in all competitions (D2 L2).
• On 2 December, an added-time goal from Hernâni – the 88th-minute substitute's first in the league for Porto since April 2015 – proved enough for a 1-0 derby win at Boavista.
• That was Porto's 50th goal of the season in all competitions; 18 players have been on the scoresheet.
• Jesús Corona is the only player to have featured in all 22 Porto games this season; defender Felipe has played 21 times, always for 90 minutes.
• Moussa Marega scored two against Portimonense on Friday, the first time the striker had found the net more than once in a game since a 5-1 win away to the same club on 25 February.
• Francisco Soares, who was also on target on Friday, has six goals in ten matches. He was left out of Porto's UEFA Champions League squad after missing the start of the season through injury.
• Porto have conceded only two goals in their last nine league games.
• Vincent Aboubakar suffered a serious knee injury against Tondela on 28 September and is expected to be sidelined for several months.