UEFA Champions League statistics
• Madrid have conceded 399 goals in the European Cup.
• Cristiano Ronaldo is the top scorer in this season's competition after 11 games with 12 goals. He has found the net 21 times in his last 18 UEFA Champions League appearances.
• Ronaldo's strike in Dortmund brought up his half-century in the competition. Only four players have previously reached 50 UEFA Champions League goals: Raúl González, Ruud van Nistelrooy, Lionel Messi and Thierry Henry. Despite taking 27 games to get off the mark, he reached the milestone on his 91st appearance, the third fastest to get to 50 behind Van Nistelrooy (62) and Messi (66).
• Ronaldo, who has played every minute of Madrid's campaign, has had 52 attempts on target and 20 wide, both more than any other player – the next highest shots on target is Messi's 28.
• Pepe has also featured in all 11 Madrid matches this season.
• Madrid have managed just one clean sheet in the competition this season and their tally of 18 goals conceded is more than any other team still involved.
• At 17 years and 353 days, José Rodríguez surpassed Raúl as Madrid's youngest ever European Cup player on matchday six.
• Álvaro Arbeloa, the only player to have been sent off twice in this season's competition, is available after serving a one-match ban. Sergio Ramos and Michael Essien are within a booking of suspension.
• José Mourinho made eight changes to the side that started in Dortmund – with only Diego López, Sami Khedira and Pepe retaining their places – as Madrid won 2-1 at Club Atlético de Madrid on Saturday. It was the Merengues' record-extending sixth successive Liga win at the Vicente Calderón.
• Ronaldo has scored 51 goals in 50 games for Madrid this season and has 31 Liga goals to his name this term. He is the first Madrid player to score 30 in a season on three occasions.
• Ronaldo has scored 107 goals in 96 appearances for Madrid at the Santiago Bernabéu.
• Madrid are 40 games unbeaten at the Bernabéu, since a 2-1 cup defeat by FC Barcelona on 18 January 2012.
• The Merengues have scored 78 goals in 26 outings at the Bernabéu this season, an average of three per game. They have struck three goals or more in each of their last four home matches.
• Marcelo has missed Madrid's last two games with a thigh injury sustained against Real Betis Balompié on 20 April. Iker Casillas has not featured since breaking his left thumb on 23 January but is available.
• Before the first leg, Madrid had not lost by more than a one-goal margin this season. They had not conceded four in a game since a 5-0 loss at Barcelona on 29 November 2010.
• Madrid will meet Atlético in the Copa del Rey final at the Santiago Bernabéu on 17 May. It will be the fifth Madrid derby final and first since Atlético prevailed 2-0 in 1992.
UEFA Champions League statistics
• Robert Lewandowski became the first player to score four goals in a European Cup semi-final in the first leg. He is the ninth man to score four times in a UEFA Champions League match; Lionel Messi is the only player to score five.
• Lewandowski has scored ten times in this season's competition, fewer only than Cristiano Ronaldo (12).
• Dortmund have scored 296 goals in UEFA competition.
• Dortmund are the only unbeaten team left in the competition. They have had 52 shots wide, won 53 corners, been caught offside 20 times and collected ten yellow cards – all fewer than any other team in the last four.
• Roman Weidenfeller and Marcel Schmelzer have played every minute of Jürgen Klopp's team's campaign. Marco Reus and Lewandowski have also featured in all 11 games.
• Kevin Grosskreutz's next yellow card will incur a ban.
• Dortmund won 2-1 at Fortuna Düsseldorf on Saturday, their sixth successive victory in all competitions – a season high.
• Klopp made ten changes to the side that started at home to Madrid, with only Mats Hummels retaining his place. Łukasz Piszczek (adductor strain), İlkay Gündoğan (neck) and Mario Götze (muscular problems) were all ruled out.
• Lewandowski had scored in each of his last 12 Bundesliga games, a club record, before failing to find the net in Dusseldorf after being brought on 21 minutes from time. He has scored 21 goals in his past 20 outings for Dortmund, also registering two in three international appearances during that time.
• Dortmund have won their last eight home games, scoring 27 goals in the process; they have won just three of their last eight on their travels, though those three wins all came in their last four away games.
• On the eve of the first leg, Dortmund announced that Götze will join FC Bayern München in July after the Bundesliga champions triggered the €37m release clause in the 20-year-old's contract.
• Götze has scored 19 goals for club and country this season, two more than he managed in the two previous campaigns combined.
• Sebastian Kehl (until summer 2014), Neven Subotić (2016), Grosskreutz (2016), Sven Bender (2017) and Schmelzer (2017) have all agreed contract extension this year.
• Dortmund won 6-1 at SpVgg Greuther Fürth on 13 April, equalling their biggest ever away win in the Bundesliga set against 1. FC Köln in 1994 and repeated against the same side in 2012. They were 5-0 up at the interval, their biggest half-time lead home or away in the league since 1964.
• Dortmund's 4-1 home defeat by Hamburger SV on 9 February was their heaviest loss since going down 5-1 at home to Bayern on 12 September 2009.
• Reus scored every goal in a 3-0 win against Eintracht Frankfurt on 16 February, becoming the first German player to record a hat-trick at home for Dortmund since Günter Breitzke in 1986.
• Reus (2), Götze and Gündoğan all scored in Germany's 4-1 FIFA World Cup qualifying victory at home to Kazakhstan on 26 March. Gündoğan also hit the woodwork twice, Götze once.
• Jonas Hofmann and Leonardo Bittencourt made their full Bundesliga debuts in the 4-2 victory over FC Augsburg on 6 April.
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