La Albiceleste have not claimed victory in the tournament since 1993, but Messi believes that under new manager Gerardo Martino they can end their long wait for success.
"We're preparing to win the Copa America, which Argentina have not won for so long," he is quoted as saying by the Argentinian Football Association's official website.
"Tata has his own ideas, as all coaches do. We are still adapting to the demands of a new coach."
Messi scored twice as Argentina claimed a 7-0 win over Hong Kong this afternoon.