"But not for a minute did I have any doubts", Messi said, convinced that, if he had played with Spain in 2010 and won the South Africa World Cup with that team, "it wouldn't have been the same" as winning it with the team from the land of his birth.
While pointing out that the Eagles would have to play as a team to carry the day on June 26 in Saint-Petersburg, Russia, Musa stressed that they must avoid any complexes that would see Messi get the edge.
Beaten finalists four years ago in Brazil, Argentina struggled in the qualifiers, only securing their ticket with a win in their final match but they were far too strong for a Haiti side 103 places below them in the Federation Internationale de Football Association rankings.
But, as brilliant as he may be, even the Barcelona talisman can not carry Argentinian hopes all on his shoulders without help from his supporting cast if they are to lift the World Cup trophy on July 15.
The Barcelona star cooly slotted home a penalty to break the deadlock in the 17th minute before adding two more goals in eight second-half minutes at La Bombonera.
With no plans to leave Barcelona any time soon, though, that may well be a question that goes unanswered. "We can not send the message that we are the best, because that's not true". After that, I have always said that I want to play football in Argentina but I don't know if it will happen.
Messi scored a hat trick and set up Sergio Aguero for the other goal as Argentina began their preparations for this summer's World Cup with a resounding 4-0 friendly win against Haiti on Tuesday.
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"Every time I have it more clear that, in Europe, Barcelona is going to be my only place", Messi said.
"I'd like to live it, be it for six months or a few matches but I don't know".
"But it would not have been the same, obviously it never crossed my mind".
Argentina will face Israel on June 9 before going head-to-head with Iceland, Croatia and Nigeria in Group D at the World Cup, where reigning champions Germany, Brazil, France and Spain are among the favourites.
Argentina, meanwhile, are in Group D with Iceland, Croatia and Nigeria.
"In a World Cup, logic is nearly never given". Argentina found that out in November, when the Super Eagles came back from 2-0 down to beat them, 4-2, in a friendly in Russian Federation.