Coach Guus Hiddink could not understand why Chelsea were not awarded three penalties in the Champions League semi-final, second leg against Barcelona.
The Blues went out on away goals after a late Barca strike but had several spot-kick appeals dismissed by referee Tom Henning Ovrebo in the 1-1 draw.
"There were three clear penalties and the boys feel that this is an injustice," said Hiddink.
"Two of them, the Barcelona players, went up with their hands in the air."
Chelsea were first denied when Ovrebo adjudged Daniel Alves had brought down Florent Malouda outside the area, when it appeared the foul took place in the box.
The ball touched my arm, but the referee decided it wasn't a penalty
Barcelona's Gerard Pique
Didier Drogba then went down under a challenge from Eric Abidal, while in the second half the ball seemed to strike the arms of both Gerard Pique and Samuel Eto'o in separate incidents.
Hiddink added: "The ref had a perfect view of the Malouda one, he was grabbed inside the box and that has to be a clear penalty.
"The Drogba one I think is a yes or a no, so you can sometimes give the benefit of the doubt to the referee in that instance.
"But then you see the two handball incidents in the second half and the players' arms going up and the ball hitting them and the referee waving them away.
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"Emotions are running very high with the players because it's not just one decision in doubt, it's several."
Pique, who will now play against his former club Manchester United in the final in Rome on 27 May, admitted he could have conceded a spot-kick.
"The ball touched my arm," he confirmed. "The referee decided it wasn't a penalty and one has to respect the referee's decisions."
Barca coach Pep Guardiola, who has reached the Champions League final in his first season as a manager, said he could sympathise with Chelsea's frustrations.
"I can understand that Chelsea can be disappointed about the performance of the referee," stated Guardiola.
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