Cristiano Ronaldo in Portugal

Ronaldo earned his first cap for Portugal in a 1–0 victory against Kazakhstan on 20 August 2003. He was called up for Euro 2004, scoring in a 2–1 group stage loss to eventual champions Greece and in a 2–1 semi-final win over the Netherlands. He was named in the team of the tournament despite finishing with only two goals. He also represented Portugal at the 2004 Summer Olympics.
2006 World Cup
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.
Post-World Cup
One day after his 22nd birthday, Ronaldo captained Portugal for the first time in a friendly against Brazil on 6 February 2007. This move was in honour of Portuguese Football Federation president Carlos Silva, who had died two days earlier. Portugal coach Luiz Felipe Scolari explained, "Mr. Silva asked me to make [Ronaldo] captain as a gesture... [he] is too young to be captain, but Mr. Silva asked me, and now he is no longer with us."
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.
2010 World Cup
On 15 June 2010, in Portugal's opening 2010 FIFA 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 failed to make an impact in the World Cup; after going scoreless in the qualifiers, his only goal came in Portugal's 7–0 group stage thrashing of North Korea on 21 June, which marked his first international goal in sixteen months. Portugal were ultimately eliminated by Spain in the round of sixteen.