The South Americans go in to the game needing a win to have a chance of qualifying for the last 16 of the World Cup, after two shock results in their opening Group D matches.
They were held to a 1-1 draw against Iceland, who are playing in their first World Cup, and lost to Croatia 3-0, to leave them bottom of the group.
Chelsea goalkeeper Willy Caballero, who has started in those two defeats, was particularly criticised for a terrible mistake which gifted the ball to Croatian winger Ante Rebic to volley home the first of his nation´s three goals on the night.
Lionel Messi et al face a Nigerian team who will be buoyed after a 2-1 victory against Iceland in their last match, and must beat the Super Eagles to qualify for the next round of the tournament in Russia.
While coach Jorge Sampaoli has not confirmed his starting XI yet, but undersntads that something has to change against the Super Eagles to bring about an essential win for his team.
"Beyond that I have in my head the team, I do not want to confirm because I still did not communicate it to the players,"
Armani, who plays for Argentine side River Plate, is not exactly the future of his nation's goalkeeping options being aged 31, but he would still relish his chance to represent his country for the first time, but sympathises with his team-mate Caballero.
"If I get the chance to play, I'll be ready and psyched
"What happened to Caballero is normal. It can happen to anyone. Each one has had to live through similar moments."
Argentina's critical game against Nigeria will come on Tuesday in Saint Petersburg.