Chelsea have won their last eight encounters with Portuguese sides and on his return to Porto on matchday two, José Mourinho would dearly love to extend that to nine.
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José Mourinho returns to FC Porto, with whom he first won the UEFA Champions League, in charge of a Chelsea FC side looking to take maximum points from their opening two games.
• Chelsea have had the upper hand with four victories in the previous six encounters, Porto winning only one. The Londoners have won each of the last three – all by a single goal.
• They last faced each other in the 2009/10 UEFA Champions League group stage when Chelsea came out on top 1-0 through Nicolas Anelka's second-half goal.
• The lineups at Estádio do Dragão on 25 November 2009 were:
Porto: Beto, Săpunaru (Farías 79), Rolando, Bruno Alves, Álvaro Pereira, Fernando, Varela (Hulk 60), Belluschi (Guarín 71), Raul Meireles, Rodríguez , Falcao.
Chelsea: Čech, Ivanović, Carvalho, Terry, Zhirkov, Ballack (Essien 68), Mikel Obi, Deco (J. Cole 76), Malouda, Anelka, Drogba.
• Anelka was also on target with the only goal in the Stamford Bridge fixture that season. Two years before, in the first knockout round, Chelsea held on for a 1-1 draw in Portugal before winning 2-1 at home.
• In the 2004/05 group stage, Mourinho's first season with Chelsea having left Porto after guiding them to their 2004 UEFA Champions League triumph, Chelsea won 3-1 at Stamford Bridge. Damien Duff was on the scoresheet as Porto prevailed 2-1 at home.
• The 2003/04 and 1986/87 European Cup winners, who are in their 20th group stage campaign, were denied a winning start on matchday one when substitute Vitaliy Buyalskiy scored a last-minute equaliser for FC Dynamo Kyiv in a 2-2 draw.
• Julen Lopetegui's men won five and drew one of their six home games (including play-offs) in last season's competition, which featured a 6-0 thumping of FC BATE Borisov. They are unbeaten in their last 10 European home matches (W7 D3).
• Porto last faced English opponents in the 2011/12 UEFA Europa League round of 32, losing 2-1 at home to Manchester City FC and 4-0 away. They have played 30 games against English clubs in Europe with the record W6 D8 L16 (W6 D6 L3 at home).
• The Londoners, who are in their 14th group stage campaign, began with a 4-0 victory over Maccabi Tel-Aviv FC.
• Last year, when they won their group for the ninth time in their last 12 campaigns, the Blues triumphed 1-0 at Sporting Clube de Portugal through Nemanja Matić's header.
• Chelsea also won the reverse fixture to extend their domination over Portuguese sides to eight successive wins.
• Chelsea's record against Portuguese clubs is W9 D1 L1. They beat Benfica in the 2013 UEFA Europa League final when Branislav Ivanović's header in the last minute of added time earned a 2-1 win at the Amsterdam ArenA.
Coach and player links
• Iker Casillas played under José Mourinho at Real Madrid CF.
• Radamel Falcao played for Porto from 2009 to 2011.
• Diego Costa scored past Helton in Club Atlético de Madrid's 2-0 win against Porto in the 2013/14 UEFA Champions League group stage.
• Falcao scored past Gianelli Imbulla's Olympique de Marseille and Vincent Aboubakar's FC Lorient in AS Monaco FC's 2-1 and 1-0 victories respectively in 2013/14; past Casillas in Madrid's 4-1 triumph over Atlético in the 2011/12 Liga and again in another defeat (1-2) the following season.
• In the 2014/15 Ligue 1 campaign, Aboubakar and Falcao swapped goals in Monaco's 2-1 defeat by Lorient.
• Cesc Fàbregas scored past Casillas for FC Barcelona in the 2011/12 Liga season and past Helton in the 2011 UEFA Super Cup between Porto and the Blaugrana.
• Pedro Rodríguez has scored four goals past Casillas – in the 2009/10 and 2010/11 Liga, 2010/11 UEFA Champions League semi-finals and 2012 Spanish Super Cup.
• International team-mates:
Casillas, Cristian Tello, & César Azpilicueta, Cesc Fàbregas, Pedro Rodríguez, Diego Costa (Spain)
• Played together:
Maxi Pereira & Ramires (2009/10) & Matić (2011–14) (Benfica).
Cristian Tello & Fàbregas (Barcelona).
• Casillas could make his 152nd UEFA Champions League appearance against Chelsea, more than any other player in the competition's history. He is currently level with Xavi Hernández on 151 matches.
• Iván Marcano is available after being banned on matchday one, when Lopetegui served a touchline suspension.
• Porto are 12 matches unbeaten in all competitions.
• André Silva sustained an ankle injury while playing for Porto's B side on 20 September – he is expected to be out for two months.
• The Dragons have kept a clean sheet in each of their last 13 home Liga fixtures, a run stretching back to mid-December.
• That 2-0 defeat by Benfica was also the last time Porto lost at the Estádio do Dragão.
• Héctor Herrera extended his contract until June 2019 on 15 September.
• Chelsea's three-game winning run in all competitions was ended by a 2-2 draw at Newcastle United FC on Saturday evening. The Blues have scored 12 goals in their last four matches.
• Kurt Zouma scored his first Premier League goal in the 2-0 home success against Arsenal FC on 19 September, while Kenedy opened his account for the west Londoners as they eased to a 4-1 victory at Walsall FC in the League Cup third round four days later.
• Diego Costa is serving a three-game domestic ban.
• Chelsea have conceded 14 league goals this season; they did not ship as many last term until their 19th game.