The 25-year-old scored a La Liga record 50 goals for Barcelona, edging out fellow Spanish league star Cristiano Ronaldo of Real Madrid by four goals.
''It is a prize for scoring goals, but without my teammates I couldn't have scored them,'' he humbly told reporters.
Messi, who scored his 300th and 301st career goals with a brace in Barcelona's 5-0 win over Rayo Vallecano on Saturday, also won the award in 2010 for his 34 goals that helped his club win the league title.
"I am happy to win my second Golden Boot," he said. "Although individual trophies are not what I compete for, I play to win team trophies."
The Argentine thanked his Camp Nou employers and revealed he hopes to stay at the club for the whole of his career. He has never played for another club team.
"I'm grateful to Barcelona for what they've done for me. My dream is to end my career at the club, before returning to Argentina," Messi added.
His club coach Tito Vilanova also took the time to comment on his player's achievement, claiming the forward was a unique phenomenon.
"Messi Golden Boot? I don't think we'll ever see another player like Leo. Mainly because of the way he understands the game," he praised.
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