The trio have applauded the Barcelona forward ahead of entering the tournament, and despite their collective abilities, feel inferior to the Camp Nou superstar.
"Without doubt he [is on] another planet, because he does things others can not," Ganso told ESPN Brazil.
Milan forward Pato echoed his international team-mate's sentiments despite believing in his own and his side's qualities.
"I arrived in Milan when I was 18. But my time in Italian football helped me to mature. Today I am a complete player, the number 9 for Brazil. [However] when Messi plays [he] is the best.
"With Ganso, Neymar and Robinho [we] will have a great championship. I have [a] very good relationship with my peers both on and off the pitch. This tournament is very important to me," Pato said.
The comments come as Neymar admitted that he wanted to work hard at Santos to be as good as Lionel Messi, who he also believes cannot be outdone in world football.
The 19-year-old continued by stating his admiration for national coach Mano Menezes and hoping for a successful tournament.
"[He] is a great coach. I learn a lot from him. Hopefully this will be my Copa America," he concluded.
Brazil start their title defence against Venezuela on Sunday at the Estadio Ciudad de La Plata.
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