The diminutive attacker enjoyed an impressive 2011-12 campaign, scoring 73 goals in all competitions to help the Blaugrana win the Spanish Supercopa, Uefa Super Cup, Club World Cup and Copa del Rey.
Barcelona will face Real Madrid in the Supercopa in August and Messi refuses to rule out his side's chances of winning every competition.
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|La Liga giants target more trophies
"We know it will be very hard, but we have not yet got over the semi-final defeat against Chelsea in the Champions League and the penalty I missed, and also the defeat against Madrid at Camp Nou."
Earlier in the week, Argentine physio Fernando Signorini stated that Messi would reach his peak over the next few years, and the 25-year-old reckons that there is still room for improvement.
"I hope to improve every year. I hope I will be injury-free this season and that I will be available to play every match.
"I try to surpass myself not in terms of goals, but in terms of my growth as a player and in what I can give to the team.
"I hope that there is still margin for me to continue to grow. My goals are in terms of collective titles."
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"With the forwards that we have, there is no need to sign more attackers," Messi explained. "It is crucial that Villa returns.
"He is doing very well and I hope he will be the same Villa as before. He is a very important player, he scores a lot of goals and we missed him last season."