Sampaoli has the benefit of having arguably the world's best player at his disposal and the former Chile and Sevilla coach said Messi was ready to shine.
In one year at Sevilla he coached them to an impressive fourth place in the Spanish league, behind the might of Real Madrid, Barcelona and Atlético Madrid. "It's a boost for us to see how excited he is with this new stage (for Argentina)", Sampaoli told reporters.
Only the top four qualify automatically for the tournament in Russian Federation next year with fifth-place earning a play-off against the winners of the Oceania region. "There are some very good teams trying to do the same thing as us", added Sampaoli, who has signed a deal until the 2022 World Cup.
The Casilda native has been linked with the job for months, and speculation only heightened when Edgardo Bauza was relieved of his duties in April after less than a year in charge.
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Sampaoli has taken charge of the team at a time when their qualification for the 2018 World Cup to be held in Russian Federation is in jeopardy.
"I dream of building a strong squad".
"I spoke with Leo and we're both excited", said Sampaoli.
Argentina face four further World Cup qualifying games, starting with a stern test away to Uruguay in August.
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But Sampaoli believes in their chances of reaching Russian Federation 2018, saying: "We are convinced that we have the resources to qualify". 'We want the world's best player to feel happy being here.
Sampaoli will travel to Melbourne on Friday morning to begin coaching the squad ahead of two global friendlies.
His first challenge as Albiceleste boss will come with a baptism of fire on June 9, when he takes on eternal rivals Brazil in a friendly to be played in Australia.
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