International Career

In June 2004, he debuted for Argentina, playing in an under-20 friendly match against Paraguay. In 2005 he was part of a team that won the 2005 FIFA World Youth Championship in the Netherlands. There, he won the Golden Ball and the Golden Shoe.

He made his full international debut on 17 August 2005 against Hungary at 18 years of age. He was substituted on during the 63rd minute, but was sent off on the 65th minute because the referee, Markus Merk, found he had elbowed defender Vilmos Vanczák, who was tugging Messi's shirt. The decision was contentious and Maradona even claimed the decision was pre-meditated. Messi returned to the team on 3 September in Argentina's 1–0 World Cup qualifier away defeat to Paraguay. Ahead of the match he had said "This is a re-debut. The first one was a bit short." He then started his first game for Argentina against Peru; after the match Pekerman described Messi as "a jewel".

On 28 March 2009, in a World Cup Qualifier against Venezuela, Messi wore the Argentine number 10 jersey for the first time. This match was the first official match for Diego Maradona as the Argentina coach. Argentina won the match 4–0 with Lionel Messi opening the scoring.

2006 FIFA World Cup-

The injury that kept Messi from playing for two months at the end of the 2005–06 season jeopardised his presence in the World Cup. Nevertheless, Messi was selected in the Argentina squad for the tournament on 15 May 2006. He also played in the final match before the World Cup against the Argentine U-20 team for 15 minutes and a friendly match against Angola from the 64th minute. He witnessed Argentina's opening match victory against Ivory Coast from the substitute's bench. In the next match against Serbia, Messi became the youngest player to represent Argentina at a World Cup when he came on as a substitute for Maxi Rodriguez in the 74th minute. He assisted Hernan Crespo's goal within minutes of entering the game and also scored the final goal in the 6–0 victory, making him the youngest scorer in the tournament and the sixth youngest goalscorer in the history of the World Cup. Messi started in Argentina's following 0–0 tie against the Netherlands. In the following game against Mexico, Messi came on as a substitute in the 84th minute, with the score tied at 1–1. He appeared to score a goal, but it was ruled offside with Argentina needing a late goal in extra time to proceed. Coach José Pekerman left Messi on the bench during the quarter-final match against Germany, which they lost 4–2 on a penalty shoot out.