This comes after his dedication to the national team was called into question following a turbulent few days on World Cup duty.
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The 37-year-old appeared angry after being substituted in Portugal's group stage clash with South Korea, leading to him being dropped for their last-16 clash with Switzerland.
Reports then suggested that Ronaldo had threatened to leave Portugal's World Cup set-up, something that the national team have denied.
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Following on from that statement, Ronaldo shared a message of unity on social media.
Taking to Instagram, Ronaldo wrote: "A group too united to be broken by external forces.
"A nation too brave to be intimidated by any adversary.
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"A team in the true sense of the word, that will fight for the dream until the end!
"Take a leap of faith with us! Come on, Portugal!"