The Reds midfielder hails the brilliance of his international colleague.
Manchester United's Cristiano Ronaldo is currently FIFA's World Player of the Year, and also won the Ballon d'Or ahead of the little Argentine in 2008.
However, Messi's international team-mate Mascherano feels these roles will be reversed next year, when he fully expects Messi to be crowned the World Player of the Year.
Messi scored the second goal in a 2-0 win for Barcelona over Ronaldo's United in the Champions League final on Wednesday and Mascherano feels this must tip the balance in Messi's favor.
Speaking to Estudio Futbol, Mascherano said, "Not many teams can play a final like Barcelona did.
"They were very faithful to their style and I think that's very important. They are the best team in the world because they have shown that in a final of the Champions League.
"FIFA doesn't have any excuse now for (not) naming Messi as the best player in the world.
"He is going to win the golden ball. He showed his capacity to keep on fighting and, after what he did against Manchester United, he showed that he is the best."
The pair will play together in Argentina's upcoming World Cup qualifiers against Colombia and Ecuador.
Nick Turner, Goal.com