The Juventus star has not been a part of the national team since Alejandro Sabella's appointment as coach and was left out of the squad for the tournament in Brazil.
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"It's totally unfair that he was not called up," Mansilla told the press. "They are without the player of the people.
"Everybody knows that Carlitos is better than the 23 that are in the national team and will play in Brazil.
"On the one hand, however, it is good for us that he is not with the Albiceleste so he can go on holiday with [his children] Florentia, Katie and Lito, who enjoy spending time with their dad.
"Now we'll go with the gang to Marbella: he and his friends play a round of golf at the Open Fuerte Apache, there'll be women there and we'll be at the beach with the children."