Messi along with his Argentine teammates have failed to end La Albiceleste's drought, losing in two successive Copa America finals - in 2015 and 2016, and also finishing runners to Germany at the 2014 World Cup in Brazil.
The Argentine worldwide footballer will now play for Barca until 2021.
He also insisted he is happy with Valverde's rotation policy.
It's hard for me not to play or to be subbed off, but I realised and understood that it was for the best.
"I have come to understand that the season is long and that some periods are more important than others".
"Being on the bench is disgusting, ' 30-year-old Messi explained".
"It is very ugly to see the things that happen in Argentina, that you can go out on the street and people want to rob you and that they can kill you".
Jorge Sampaoli's side nearly did not qualify for the tournament, but a Messi hat-trick in their final qualifier against Ecuador secured their spot in Russian Federation.
Argentina, who have not won a major worldwide trophy since lifting the Copa America in 1993, were last week drawn in Group D for next year's World Cup finals in Russian Federation, alongside Nigeria, Croatia and Iceland.
"We have had some good games, or good spells under Sampaoli".
He subsequently reversed his decision and will be the linchpin of a talented Argentina side as they aim to win the World Cup next year.
"But it is true that we have to improve if we want to be world champions". Let us know in the comments section below.