Argentina had been without a manager since they dismissed Edgardo Bauza on April 10 while holding the job for just eight months.
Sampaoli was finally unveiled as head coach on Thursday, signing a deal through to the 2022 World Cup.
Jorge Sampaoli, newly appointed coach of Argentina's national soccer team holds a jersey with his name on it during his official presentation at the squad's camp in Buenos Aires, Argentina, June 1, 2017.
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Until Wednesday, Sampaoli had been the coach of Sevilla club in Spain, with the team finishing fourth in La Liga last season.
"The difficulty in the qualifiers is real: Argentina is not qualified, but we know we have the resources for that", he said. It's a boost for us to see how excited he is with this new stage (for Argentina).
Argentina are now fifth in the 10-team South America zone World Cup qualifying standings with four games remaining.
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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.
"The important thing is that Messi has compatible players".
"I spoke with Leo yesterday and we are both excited about this project".
"We want for the best player in the world to be happy being here", Sampaoli said. "I want to get back to talent and the art of dribbling, in order to move forward".
'Dybala has a high level and what stands out is his inventiveness, ' Sampaoli said as Thursday's press conference.
Sampaoli will travel to Melbourne on Friday morning to begin coaching the squad ahead of two worldwide friendlies.
Argentina will take on rivals Brazil in Melbourne next Friday before facing Singapore at the National Stadium on June 13.