Chelsea will renew their UEFA Champions League rivalry with Barcelona after beating Benfica to reach the semi-finals.
Here, Sky Sports takes a look at five memorable moments from their recent encounters.
BARCA'S AMAZING COMEBACK (1999-00 quarter-final)
The Blues were favourites to reach the semi-finals after winning 3-1 at Stamford Bridge and were only seven minutes from doing so when Barca substitute Dani took the second leg into extra-time. Celestine Babayaro's dismissal for conceding a penalty proved fatal as Barca won 5-1 and 6-4 on aggregate.
MOURINHO RANT (2004-05 last 16)
The next meeting during Jose Mourinho's first season in charge was also a classic, with the Blues recovering from a controversial first-leg defeat to win after a Stamford Bridge thriller. Chelsea raced to a 3-0 lead but were heading out after a superb Ronaldinho double before John Terry's header sealed it. The win was overshadowed by Mourinho's comments about first-leg referee Anders Frisk, whom he accused of inviting Barca boss Frank Rijkaard into his dressing room at half-time. Frisk decided to hang up his whistle after receiving death threats, while Mourinho was branded an "enemy of football" by UEFA's referees' chief and handed a two-match ban.
DEL HORNO SEES RED (2005-06 last 16)
Barca gained revenge for their defeat a year earlier thanks to more controversial refereeing. Asier del Horno was sent off in the first leg at Stamford Bridge after clashing with Lionel Messi, whose theatrical reaction sparked a melee. Ten-man Chelsea actually took the lead, but Barca won 2-1 before securing a comfortable draw at the Camp Nou.
LAMPARD'S INCREDIBLE EQUALISER (2006-07 group stage)
Chelsea had already won at Stamford Bridge and secured a 2-2 draw at the Camp Nou that ultimately helped them top Group A thanks to Didier Drogba's stoppage-time equaliser. But it was an earlier leveller from Frank Lampard that will forever be remembered, the midfielder pirouetting on the byline and somehow chipping Victor Valdes from an impossible angle.
MORE REFFING HELL (2009 semi-finals)
"F****** disgrace!" bellowed Didier Drogba. "I don't know if he's a referee or a thief," cried Jose Bosingwa. That was Chelsea's reaction as they missed out on back-to-back finals on away goals. Michael Essien scored a superb volley and the Blues were denied a succession of penalties by referee Tom Henning Ovrebo before Andres Iniesta equalised deep into stoppage-time. Drogba was banned for four matches - later reduced to three - for confronting Ovrebo at the final whistle.
Who will win the UEFA Champions League?