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Team striker Cameroonian Samuel Eto'o claims that the clash, after the Champions League round of 16 second leg with , arose because he received racial abuse from the staff at Stamford Bridge.
"He called me a monkey," the footballer told journalists after the match. "I understood that. He called me a monkey, and I am very angry."
UEFA Communications Director William Gaillard said: "If a formal complaint has been made, then we will of course investigate it, but we need some evidence of what happened. If a complaint has been made, we won't just leave it. If one person said something, we expect Chelsea to take action, but there must also be neutral witnesses."
In the heated match, which ended 4-2 in favor of the hosts and sent them to the next stage, there was a display of top quality football and serious incidents on the field were avoided.
However, "Barca" players protested against the fourth, crucial goal, scored by "Chelsea" captain John Terry into Victor Valdes' net. They believed the goal should not have been allowed as there was a foul on the goalkeeper at that moment.
Nevertheless, an unpleasant scuffle occurred at the end of the match. Chelsea's chief scout Andre Villas almost incited the Barcelona bench as they noticed a projectile flying toward their side of the bench.
Players and referees were involved in scuffles, but they ended as quickly as they started.
Eto'o added: "The atmosphere around the Chelsea bench was disgusting, their coach's behavior was disgusting. If Chelsea win the European cup, it will be laughable. They are not a good team. They scored three quick goals because we allowed them, and the referee favored them. They say Pierluigi Collina is the best referee in the world. I think he is one of the worst."
