Chelsea have denied claims by Barcelona striker Samuel Eto'o that he was racially abused by a steward after the Blues' 4-2 Champions League victory.
A spokesman for the Stamford Bridge club said: "Chelsea utterly refutes that any racist comments were made by any of its permanent or matchday staff.
"Chelsea has an excellent record of supporting anti-racism campaigns and condemns all forms of racism."
Barca coach Frank Rijkaard also played down the tunnel fracas after the game.
Rijkaard had to be restrained after the final whistle, but insisted: "It was not a big deal.
"You know what it's like after an emotional game like that, all feelings running high. Someone came forward and kind of insulted us on our bench.
"I don't know who it was, just some guy. It was nothing serious."
Reflecting on the game - and the war of words beforehand - the Dutchman added: "You always feel bitter after a loss, but maybe I feel a bit more bitter because of all the lies that were told before this game.
"I suppose all the stuff surrounding the game wants you to win a bit more, and makes it hurt more when you lose.
"These things happen when people show their emotions sometimes."
Cameroon international Eto'o said that an exchange with an unknown figure had made him "very angry" and he also took a verbal swipe at Mourinho's Chelsea and referee Pierluigi Collina.
"Mourinho is shameless. If this team wins the Champions League, it would make you want to retire, said Eto'o.
"With so much money and so many players, what they do is not football."
"Collina helped Chelsea, he denied me a clear penalty and in the fourth goal they fouled Victor Valdes, but those things happen," he added.
Uefa has already been asked to investigate claims that Rijkaard met referee Anders Frisk in his dressing room at half-time of the first leg at the Nou Camp.
The Blues are facing a double disciplinary charge for their late arrival for the second half in that game, and for Mourinho's absence from the post-match news conference.
And Uefa could be asked to take further action if Barcelona make a formal complaint over events at the second leg.
William Gaillard, Uefa's director of communications, said: "If a formal complaint is made, of course we will investigate it but there will have to be some evidence of what happened."