Barcelona are playing in their fifth consecutive Champions League semi-final, the longest run in the history of the competition (since 1992/93).
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Chelsea and Barcelona have each reached the semi-final stage of the Champions League six times in the last nine seasons (since 2003/04), the best tallies over that period.
Chelsea and Barcelona have played each other 10 times in the Champions League, with each team winning three times. The four other games were drawn.
Chelsea are unbeaten in their last five Champions League games against Barcelona, four of which have been draws.
Chelsea and Barcelona have met four times in knockout ties in the Champions League, with the Catalans progressing on three occasions.
Barcelona last beat Chelsea in February 2006 when both sides met in the last 16 of the Champions League. The Catalans won 2-1 at Stamford Bridge.
Chelsea have never lost at Stamford Bridge in a Champions League semi-final (two wins, three draws).
Barcelona have won three of their last 12 Champions League away games in the knockout stages.
Barcelona are the only side, along with Real Madrid, yet to lose a game in the Champions League this season.
Chelsea have opened the scoring in each of their 10 Champions League games this season. Only Real Madrid can match the Blues' record.
Barcelona have scored the most goals in the Champions League this season: 33 in 10 games (3.3 per game average). That's 12 more than Chelsea (21).
Barcelona have won the most penalties in the Champions League this season (5) with Chelsea winning the next most (3).
Barcelona have completed 3,244 more passes than Chelsea in the Champions League this season.
Under Pep Guardiola, Barcelona have only failed to score twice in 24 knockout games in the Champions League (against Chelsea & AC Milan).
Lionel Messi is the first player to score 14 goals in a Champions League season. He's netted 32 goals in his last 27 games in the competition.
Messi is third in the all-time Champions League top scorers list with 51 goals. Only Raul (71) and Ruud Van Nistelrooy (56) have been more prolific.
Chelsea are the team Lionel Messi has played the most against in the Champions League without scoring: six games, zero goal.
Petr Cech (43) has had to make 34 more saves than Victor Valdes (9) in the Champions League this season.