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.

Cristiano's quality performance at the EURO 2012

Ronaldo scored seven goals in Portugal's UEFA Euro 2012 qualifying campaign, behind Germany's Miroslav Klose and Netherland's Klaas-Jan Huntelaar. Portugal were drawn in Group B with Netherlands, Denmark and Germany, which was widely referred to as the "group of death" of the tournament. In an interview with Kicker Magazine, Ronaldo stated that "I will only be fully content with my career when I have lifted a trophy with Portugal."

After the opening defeat against Germany, Cristiano Ronaldo was criticised for under performing, showing frustration at his and his team-mates' errors and for walking off into the changing-rooms straight after the match, rather than thanking the crowd with the team. His team-mate Nani later defended him stating that he had left the pitch since he needed to instantly be treated for a possible injury. He also stated that he had been training well and contributing to the team, and that he was under excessive of pressure since football is a team sport, but that he would soon silence his critics. Luis Figo however criticised his behaviour stating that it is the captain's responsibility to always defend the group, despite the result.

During the match between Denmark and Portugal, the Denmark fans chanted Lionel Messi's name whenever Ronaldo was on the ball. Ronaldo squandered two gilt-edged one-on-one chances, and Ronaldo looked frustrated and tormented throughout. Asked about the Messi chants, Ronaldo responded irritatedly: "You know where he was at this time last year? Do you know? He was being eliminated in the Copa America, in his own country. I think that's worse, no? And people say that he is the best player in the world. This sort of thing is normal for great players. Cristiano Ronaldo received criticism from the press for his reaction."

In the final group match between Portugal and the Netherlands, Ronaldo scored two goals to secure a 2–1 victory for Portugal, allowing them to advance to the quarterfinals. He also struck the post twice in the match and was named Man of the Match.

Cristiano Ronaldo was praised for his performance against the Czech Republic in the Quarterfinals. After he had twice hit the post, he finally darted in from behind his marker in the 79th minute and headed a cross from Joao Moutinho, sending Portugal into the semifinals with a 1-0 victory over the Czech Republic. After scoring the winning goal, he ran to the camera and was initially accused of chanting "Messi" mockingly, although upon further review, it was found that this was incorrect and that he had in fact simply stated "para ti" as he had dedicated the goal to his son. Ronaldo was also named Man of the Match.

Ronaldo had several chances for Portugal in the semifinals against Spain, but he sent three shots over the bar. Ronaldo had his best chance in the 90th minute but shot the ball high and wide. The match ended with penalties, but Ronaldo did not take a penalty in the shootout. He had been slated to take the fifth one, but it never got that far. The Portugal coach, Paulo Bento, knocked back criticism of Cristiano Ronaldo not being employed earlier in the shootout. "Well we had this plan and if it would have been 4–4 and he would have taken the last penalty we would talk in a different way," Bento said.

Before and throughout the tournament, Ronaldo was particularly hailed by Diego Maradona who even declared Ronaldo as "the best player on the planet" and that "[Ronaldo] has shown his countrymen that he does deserve a monument in Lisbon." Ronaldo was included in the UEFA Euro 2012 Team of the Tournament, the second time after 2004, and finished the competition as the joint best scorer with three goals, along with five other players, although Fernando Torres claimed the golden boot.

C. Ronaldo and World Cup 2010

On 15 June 2010, in Portugal's opening World Cup match against Côte d'Ivoire, Ronaldo was tackled by right-back Guy Demel, which led to an argument and both being booked. The next day, Portugal contacted FIFA to suggest that Ronaldo's yellow card be rescinded since he was "pulled into" the confrontation after having already moved away from the spot where he was tackled, but the appeal was rejected.

Ronaldo was named Man of the Match in all three of Portugal's Group G matches at the World Cup. His only goal of the tournament came in Portugal's 7–0 group stage thrashing of North Korea on 21 June, which marked his first international goal in 16 months. Portugal were ultimately eliminated by Spain in the Round of 16.

Ronaldo and Euro 2008

Ronaldo scored eight goals in Portugal's UEFA Euro 2008 qualifying campaign, behind Poland's Ebi Smolarek, but finished with only one goal in the tournament as Portugal were eliminated in the quarter-finals by Germany. When Carlos Queiroz was named Portugal's new coach in July 2008, he appointed Ronaldo as team captain.

Ronaldo was named Man of the Match against the Czech Republic in Group A of the European championships.

Cristiano Ronaldo and World Cup 2006

Ronaldo was the second-highest scorer in FIFA World Cup qualification in the European zone with seven goals, and scored his first World Cup goal against Iran with a penalty kick.

During a quarter-final match against England on 1 July 2006, Ronaldo's United teammate Wayne Rooney was sent off for stamping on Portugal defender Ricardo Carvalho. The English media speculated that Ronaldo had influenced referee Horacio Elizondo's decision by aggressively complaining, after which he was seen in replays winking at the Portuguese bench following Rooney's dismissal. After the match, Ronaldo insisted that Rooney was a friend and that he was not pushing for Rooney to be sent off. On 4 July, Elizondo clarified that the red card was due to Rooney's infraction and not the fracas between Rooney and Ronaldo that followed.

The angry reaction from the English press caused Ronaldo to consider leaving United, and he allegedly told Spanish sports daily Marca that he wished to move to Real Madrid. In response to the speculation, Ferguson sent Portuguese assistant manager Carlos Queiroz to speak to Ronaldo in attempt to change his mind, a sentiment that was shared by Rooney. Ronaldo stayed, and signed his new five-year extension in April 2007.

Ronaldo was booed during Portugal's semi-final defeat to France, and missed out on the competition's Best Young Player award due to a negative e-mail campaign from England fans. Though the online vote only affected the nomination process, FIFA's Technical Study Group awarded the honour to Germany's Lukas Podolski, citing Ronaldo's behaviour as a factor in the decision.

Cristiano Ronaldo and Euro 2004

Ronaldo was called up for Euro 2004, scoring his first international goal in a 2–1 group stage loss to eventual champions Greece and scoring again in a 2–1 semi-final win over the Netherlands. He was featured in the UEFA Euro All-Star Team of this competition, despite finishing with only two goals. He also represented Portugal at the 2004 Summer Olympics.