Barcelona (ESP) v Paris Saint-Germain (FRA)
Manchester City (ENG) v Lyon (FRA, holders)
• All 12,945 tickets have been snapped up, guaranteeing Barcelona's record crowd.
• Barcelona are the first Spanish club to reach the semi-finals, having fallen 1-0 on aggregate to Paris in the last eight a year ago.
• Paris are in their third semi-final – they won the first to finish as 2015 runners-up but lost to Lyon last season.
• Paris are missing defender Laura Georges through suspension for the first leg.
• Barcelona have won all six of their European matches this term while Paris had to recover from first-leg defeats in the round of 32 and quarter-finals.
• A cosmopolitan Paris squad includes Spanish internationals Verónica Boquete (once of Espanyol) and Irene Paredes. Boquete helped Frankfurt lift this title in 2015, beating Paris in the final.
• Barcelona's only foreign players are Danish defender Line Røddik Hansen and Brazilian midfielder Andressa Alves.
• Both teams' European top scorers this season have five goals: Barcelona's Jenni Hermoso and Cristiane of Paris.
• Paris are coached by Patrice Lair, who led Lyon to glory in 2011 and 2012. From those victorious Lyon squads, Paris now boast Shirley Cruz Traña as well as Georges.
• The second leg will be at the Parc des Princes, where Paris have twice won in past quarter-final ties.
• Manchester City, on their European debut, have knocked out two past finalists in Zvezda-2005 Perm and Fortuna Hjørrring.
• Lyon, winners in 2011, 2012 and 2016, are in a joint-record eighth semi-final and are also looking to equal FFC Frankfurt's high-water marks of six final appearances and four titles.
• Lyon eliminated last year's runners-up Wolfsburg in the quarter-finals, in a rematch of the 2016 decider.
• Sarah Bouhaddi, Wendie Renard, Camille Abily and Eugénie Le Sommer have all been part of Lyon's three past triumphs.
• Abily and Le Sommer are both on five European goals for the campaign while City's leader Lucy Bronze has three.
• This tie brings together the two sides' high-profile American winter signings: City's Carli Lloyd and Lyon's Alex Morgan.
• City midfielder Kosovare Asllani was previously at Paris, for whom she played in the 2015 final.
• Just one English team has figured in a European final to date: Arsenal, who lifted the 2007 UEFA Women's Cup.
• The following season, debutantes Lyon beat Arsenal in the quarter-finals and they also ousted the Gunners in the 2010/11 semis, their only previous UEFA competition encounters with English opposition.
• The return leg is at Stade de Lyon, where OL had a perfect European record until their 1-0 quarter-final second-leg reverse to Wolfsburg (they had won the first 2-0).
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