Barcelona came from behind to beat Chelsea in the Champions League after Didier Drogba's controversial red card.
Chelsea were leading after Juliano Belletti deflected Damien Duff's cross into his own net after 32 minutes.
But Drogba was then sent off by referee Anders Frisk for an innocuous-looking challenge on goalkeeper Victor Valdes after 55 minutes.
Substitute Maxi Lopez quickly fired Barca level before Samuel Eto'o smashed in the winner with 17 minutes left.
It was cruel luck on Chelsea, who had looked relatively comfortable until Barcelona were gifted a numerical advantage by flamboyant Swedish official Frisk.
Duff, having been so emphatically excluded by Mourinho 24 hours earlier, was a shock inclusion in the starting line-up - and made the most significant impact for Chelsea in the first-half.
Barcelona made a flying start, and Ronaldinho was uncharacteristically off target after two minutes following an error in midfield by Frank Lampard.
The Brazilian was in dangerous mood, and he forced Chelsea goalkeeper Petr Cech to clutch a dangerous low cross as Barcelona pressed.
But Chelsea soaked up all the pressure before delivering a classic counter-punch to take the lead after 32 minutes.
Lampard released Duff down the right flank, and with Drogba and Joe Cole unmarked and waiting for his cross, Belletti unwittingly turned the ball into his own net.
Drogba then missed a glorious opportunity to score a crucial second for Chelsea two minutes later, firing wide with only Valdes to beat after good work by Claude Makelele.
Drogba's misery was complete when he was harshly sent off by referee Frisk following a clash with Valdes 10 minutes after half-time.
The striker had every right to challenge when Belletti's back-pass fell short, but Frisk stunned Chelsea by brandishing the red card as Valdes rolled in agony from the challenge.
Barcelona made an instant change, sending on Andres Iniesta for Demetrio Albertini.
And Iniesta almost struck seven minutes later, firing inches wide with Cech beaten.
Lopez, another substitute, had only been on three minutes when he put Barcelona level, taking a pass from Eto'o and firing a comprehensive finish past Cech.
And Lopez repaid the compliment with 17 minutes left, setting up Barcelona's second for Eto'o.
It was a goal with more than a hint of good fortune, with Lopez clearly firing in a shot that found its way to Eto'o, who flashed a first-time finish past Cech.
Barcelona: Valdes, Belletti (Gerard 85), Marquez, Puyol, Van Bronckhorst, Xavi, Deco, Albertini (Iniesta 57), Giuly (Maxi Lopez 64), Ronaldinho, Eto'o. Subs Not Used: Jorquera, Sylvinho, Fernando, Abella Perez.
Goals: Maxi Lopez 66, Eto'o 73.
Chelsea: Cech, Terry, Paulo Ferreira, Gallas, Ricardo Carvalho, Makelele, Lampard, Cole (Johnson 70), Duff (Gudjohnsen 76), Tiago (Smertin 90), Drogba. Subs Not Used: Cudicini, Kezman, Geremi, Nuno Morais.
Sent Off: Drogba (56).
Goals: Belletti 33 og.
Ref: Anders Frisk (Sweden).