The Argentine is still annoyed by the manner of the Blaugrana's semi-final defeat and the penalty which he missed at a crucial stage of their second-leg clash with the BluesLionel Messi has admitted that he is still tormented by Barcelona's "unfair" elimination at the hands of Chelsea in the semi-finals of the Champions League.
The Blaugrana dominated possession and territory in both legs but the defending champions ultimately bowed out 3-2 on aggregate, with their talismanic No.10 failing to score in either game and missing a crucial spot-kick at Camp Nou.
Barca also lost their Spanish title to Real Madrid last season, but Messi has revealed that the defeat by Chelsea continues to bother him.
"I missed out winning La Liga and the Champions League, but I was more angry about the Champions League because it was unfair; because I missed a penalty," the Argentine told reporters on Tuesday.
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"But we will fight for more titles next season and the national team will look to secure a place in World Cup ."
Messi, who is currently preparing for his country's upcoming qualifier against Ecuador, is in no doubt that Barca will be in a position to reclaim their European crown even though Pep Guardiola has now been replaced at the helm by his former assistant, Tito Vilanova.
"It's not easy to replace Pep after all that we have done, but I have known Tito since I was a kid and I know what we can expect from him," the forward reasoned.
"We have done everything together with Guardiola over these four years and hopefully things will continue in the same way."
Messi hit a record-breaking 73 goals last season but there are those that believe that Real Madrid's Cristiano Ronaldo will win this year's Ballon d'Or if he shines at Euro 2012.
"I do not know, or think about it," the Rosario native insisted. "January is a long time away from now and we have many more important games to play, including the game against Ecuador.
"Then there are titles with Barcelona and with the national team, so no, I have not thought about it."
Argentina's World Cup qualifier against Ecuador takes place in Buenos Aires on June 2.