International carrer in Argentina of Lionel Messi

Often referred to as an Argentinian-Spanish player, this crossover was brought into sharp focus when in 2004, Lionel was offered the chance to play for the Spanish national U-20 team. He declined the offer given his Argentinian heritage, and was given the opportunity to play for Argentina's U-20 team in a friendly match against Paraguay in June 2004. Messi scored once against Paraguay and twice in friendly against Uruguay in July 2004. In 2005 he was part of a team that finished 3rd in 2005 South American Youth Championship in Colombia. He won the 2005 FIFA World Youth Championship in the Netherlands with the team and won the Golden Ball and the Golden Shoe, scoring in the last four of Argentina's matches and netting a total of six for the tournament.

He made his full international debut on 17 August 2005 against Hungary at the age of 18. He was substituted on during the 63rd minute, but was sent off on the 65th minute because the referee, Markus Merk, claimed that Messi had allegedly elbowed defender Vilmos Vanczák, who was tugging Messi's shirt. The decision was contentious and Maradona even claimed the decision was pre-meditated. Messi was later reportedly found weeping in the changing rooms after the decision. 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, in which he was able to win a crucial penalty for Argentina; after the match Pekerman described Messi as "a jewel". He scored his first goal for Argentina in a friendly match against Croatia on 1 March 2006.

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

On 17 November 2010, Messi scored a last-minute goal against South American rivals Brazil after an individual effort to help his team to a 1–0 win in the friendly match, which was held in Doha. This was the first time that he had scored against Brazil at senior level. Messi scored another last-minute goal on 9 February 2011 against Portugal in a penalty kick which gave his side a 2–1 victory in the friendly match, which was held in Geneva, Switzerland. He had also previously assisted the first goal. His first hat-trick for Albiceleste came against Switzerland, on 29 February 2012 which the game ended 3–1 for Argentina. On 9 June 2012, Messi scored his second international hat-trick in a friendly match against rivals Brazil, including the match winner. The match ended 4–3 to Argentina and Messi was voted man of the match. This brought his international goalscoring tally up to 26 goals in 70 matches, and brought his 2012 tally up to 7 goals in 3 matches. This was also his record-breaking 82nd goal of the season, including all club and international matches.

Messi Barcelona career in season 2011 - 2012

Messi started the season by lifting the Spanish Supercup with Barcelona, scoring three goals and providing two assists in a 5–4 aggregate win against Real Madrid. His vital interventions continued in the next official match played against Porto when he scored again following a weak back pass from Fredy Guarín before setting up Cesc Fàbregas to give Barcelona a 2–0 victory and the UEFA Super Cup, then the only official competition that remained for him to score in.

After scoring his first goal of an eventual hat-trick in an 8–0 rout against CA Osasuna, Messi produced a special celebration for Soufian, a 10-year-old Moroccan boy with Laurin Sandrow syndrome, a rare medical condition that can eventually lead to the loss of the lower extremities. Whilst Messi usually points to the sky after scoring a goal, Messi slapped his thighs as a dedication to Soufian.

In August, Messi became the second highest goalscorer surpassing László Kubala on 194 goals, being behind only to César Rodríguez on 232 goals in all official competitions.

On 28 September, Messi scored his first two Champions League goals of the season against BATE Borisov, becoming Barcelona's second highest goalscorer in its history, tying László Kubala, at 194 goals in all official competitions. He surpassed that record when he scored two goals against Racing Santander. He became second in Barcelona's La Liga goalscorers list with 132 goals, one more than Kubala. He scored his 200th Barcelona goal and two more as part of a hat-trick in his next game against Viktoria Plzeň in the Champions League.

Messi scored a brace in the Club World Cup Final against Santos FC and was recognized as the man of the match and also awarded the Golden Ball for his performance during the tournament.

Messi won the 2011 UEFA Best Player in Europe Award, beating his FC Barcelona team-mate Xavi Hernández and Real Madrid's Cristiano Ronaldo. Messi won the 2011 FIFA Ballon d'Or, again beating his team-mate Xavi and Cristiano Ronaldo. By winning the FIFA Ballon d'Or again, Messi become the fourth player to win three Ballon d'Ors, after Johan Cruyff, Michel Platini and Marco Van Basten and the second player to win three consecutive Ballon d'Ors, after Michel Platini (although two of his Ballon d'Ors are FIFA Ballon d'Ors, which he won consecutively).

On 19 February 2012, Messi, on his 200th La Liga appearance, scored four goals against Valencia CF in a 5–1 win. On 7 March, Messi became the first player to score five goals in an UEFA Champions League match since the tournament's re-establishment in 1992, helping the defending champions Barcelona win 7–1 against Bayer Leverkusen.

On 20 March, Messi scored three goals against Granada CF, making him FC Barcelona's leading goalscorer in official competitions, surpassing club legend César Rodríguez, who had previously held the record with 232.

On 3 April, Messi scored two goals from penalty kicks against Milan in the second leg of the Champions League Quarter-final, allowing him to surpass his personal record, joint with Ruud van Nistelrooy, of 12 goals in a single UEFA Champions League season. These goals allowed him to tie José Altafini's record of 14 goals in a single European Cup season in the 1962–63 season, before the tournament's re-establishment as the UEFA Champions League in 1992. Barcelona were knocked out in the semi-finals to eventual winners Chelsea.

On 11 April, Messi scored his 61th goal against Getafe CF, surpassing Isidro Langara's record of 60 goals in 1933–34, and became the best goalscorer in history in one season in Spain.

On 2 May, Messi scored a hat-trick against Málaga CF surpassing Gerd Müller's record (67 goals in 1972-73) with 68 goals, and thus becoming the best goalscorer in history in one season in Europe. It was the 21st multi-goal game of the season for Messi and his seventh La Liga hat-trick. He then scored four goals on 5 May against RCD Espanyol to take his tally to an unprecedented 72 goals, in the process becoming only the second player to pass 70 goals in a first division season since Archie Stark of Bethlehem Steel in the American Soccer League in 1924–25.

On 25 May, he scored again in the 2012 Copa del Rey Final, helping Barcelona win their 26th Spanish Cup title, and increasing his seasonal goalscoring record to an unmatched 73 goals in all competitions. This was also Guardiola's last match as Barcelona's manager, and the Cup win marked Messi's second Copa del Rey title, after losing the final the year before, as well as his 14th Barcelona trophy during Guardiola's four seasons at the club. Although Barcelona failed to win their 4th consecutive Liga title under Guardiola, finishing runners up to arch-rivals Real Madrid, Messi finished the 2011–12 season as the top goalscorer in La Liga for a second time, with a Liga record of 50 goals. He was the second best assist provider in La Liga that season with 16 assists, after Mesut Özil, who managed 17. He also ended the season as the UEFA Champions' League Top Scorer for a fourth consecutive time, with 14 goals. He was one of the top assist providers of the tournament with 5 assists and finished the season with 73 goals and 29 assists in all club competitions, with more goals and assists than any other player.