Messi announced his retirement from international after he missed during the penalty shootout of the Copa America final against Chile and his nation subsequently lost the title.
But in a statement reported by media in Argentina, the Barcelona striker said he made the U-turn for the "love of the country" and "to help from within."
"A lot of things went through my mind on the night of the final and I gave serious thought to quitting, but my love for my country and this shirt is too great," Argentina's all-time record goalscorer is reported as saying.
"We need to fix many things in Argentinian football, but I prefer to do this from inside and not criticise from outside."
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