PRE-MATCH FACTS- CHELSEA VS BASEL, MARSEILLE VS ARSENAL, BARCELONA VS AJAX, NAPOLI VS BORUSSIA DORTMUND

The facts you need to know about tonight matches

CHELSEA VS BASEL

• This is Chelsea's 11th consecutive participation in the Champions League. They've reached the semi-finals six times and the final twice, winning it for the first time in their history in 2012.
• Basel are taking part in their fifth Champions League campaign, more than any other Swiss side. Their best performance is reaching the last 16 back in 2011/12 before being knocked out by Bayern Munich.
• Chelsea and Basel's only previous meeting was in the semi-finals of the Europa League last season. The Blues won both games (2-1 in Basel and 3-1 in London).
• Chelsea are unbeaten in their last 29 games at Stamford Bridge in the Champions League group stages (22 wins, 7 draws). Their last defeat was 10 years ago against Besiktas (October 2003).
• Basel have won only three of their 16 Champions League games away from home (5 draws, 8 defeats).
• Basel have conceded 40 goals in 16 Champions League away games and only kept one clean sheet (v Spartak Moscow, November 2002).
• Jose Mourinho won 48.5% of his Champions League games as Chelsea manager (16 out of 33). His ratio with Real Madrid was 66.7%.
• Mourinho is one of four managers to have won the European Cup/Champions League with two different clubs, alongside Ernst Happel, Ottmar Hitzfeld and Jupp Heynckes.
• Samuel Eto'o has netted 27 goals in the Champions League, which makes him the second top African scorer in the competition behind Didier Drogba (40).
• Oscar has scored four goals in three Champions League games played at Stamford Bridge.

MARSEILLE VS ARSENAL

• Arsenal are unbeaten in their 10 away games against French opposition (6 wins, 4 draws). They have actually won each of their last five away matches versus French clubs.
• Marseille have only won one of their last nine Champions League games against English opposition (v Chelsea, December 2010).
• Marseille have only scored seven goals in 14 Champions League games against English clubs and never more than one in a game.
• Arsenal and Marseille's two competitive encounters have produced only one goal: a 1-0 win for the Gunners at the Vélodrome before a goalless draw at the Emirates in the 2011/12 Champions League group stages.
• Marseille have lost their last three Champions League games.
• Marseille have failed to score in five of their last eight Champions League games.
• Arsenal have only kept two clean sheets in their last 24 Champions League games away from home, one of those games being at Marseille’s Vlodrome stadium (October 2011).
• This is the 16th consecutive season Arsenal will play in the Champions League, only Manchester Utd (18) and Real Madrid (17) can boast longer current streaks.
• Arsenal have made it past the group stages in the last 10 seasons but have been knocked out at the last 16 stage in the last three campaigns.
• Their solitary Champions League final ended in defeat against Barcelona in 2006.
• Arsène Wenger has taken charge of 152 games in the Champions League, more than any other current manager. Only Alex Ferguson has more (190).
• Elie Baup won three of his 12 Champions League games as Bordeaux manager.

BARCELONA VS AJAX

• This will be the first competitive meeting between the two sides.
• Barcelona have reached the semi-finals of the Champions League in each of the last six seasons, the longest run in the history of the competition.
• Barcelona have won none of their last 4 Champions League games (2 draws, 2 defeats), their worst run since 2001/02.
• Ajax are making their 12th appearance in the Champions League (since 1992/93). Only PSV Eindhoven have qualified for the competition more times amongst Dutch sides (13).
• Ajax have won the European Cup/Champions League four times (1971, 1972, 1973, 1995), more than any other Dutch side.
• Ajax have lost their last eight games against Spanish opposition in European competition.
• Ajax have never kept a clean sheet in their last seven Champions League games, conceding 19 goals in the process.
• Ajax have won only one of their last eight Champions League games (at home v Manchester City last season).
• Lionel Messi has netted 59 goals in the Champions League, only Raul (71) has more goals to his name in the competition.

 NAPOLI VS BORUSSIA DORTMUND

• This will be the first competitive meeting between the two sides.
• Napoli are taking part in their second Champions League campaign after 2011/12 when they reached the last 16 before being knocked out by Chelsea.
• Napoli have never failed to score in the Champions League (8 games).
• Napoli are unbeaten at home in the Champions League (3 wins, 1 draw).
• Napoli are winless in their last seven encounters with German opposition in European competition (2 draws, 5 defeats).
• Borussia Dortmund are making their ninth appearance in the Champions League, only Bayern Munich have more among German clubs (17).
• Borussia Dortmund won their one and only Champions League in 1997.
• Dortmund have won only one of their last 10 Champions League games played outside the Westfalen stadion (4 draws, 5 defeats), that was against Ajax at the Amsterdam Arena last season.
• Rafael Benitez has won 53% of Champions League games as manager (44 out of 83).
• Only Cristiano Ronaldo (12) scored more goals than Robert Lewandowski (10) in the Champions League last season.
• Napoli striker José Callejón has scored seven goals in nine Champions League games.