Portugal defender Ruben Dias said Cristiano Ronaldo's presence shows their squad they can achieve anything as they prepare to make their Euro 2024 bow against the Czech Republic on Tuesday.

Portugal won Euro 2016 and are spearheaded by 39-year-old superstar striker Cristiano Ronaldo, preparing to play at a record-extending sixth Euros.

Ronaldo, the record men's international goalscorer with 130 strikes for his country, is also the all-time top scorer at the tournament with 14, a distance ahead of former France great Michel Platini in second spot on nine goals.

"I would say he represents inspiration, he represents that anything is possible, he represents all that you can dream, and achieve it," Manchester City centre-back Dias told a news conference Monday.

"Mainly I would like to say it's a pleasure to have him with us. More than all these little things or big things, him being with us in this moment of his career represents that he wants to win again.

"He's our captain and obviously we follow him to the end."

If Ronaldo scores at the Euros this summer he will become the competition's oldest goalscorer of all-time, breaking a record set by Austria's Ivica Vastic at 38 in Euro 2008.

Portugal coach Roberto Martinez said Ronaldo's experience could be vital at the tournament, along with veteran centre-back Pepe, 41.

"(Ronaldo) is very important... at tournaments, Euros and World Cups, the key is a mix of experience and new talent," said Martinez.

"Our team does it perfectly -- you mentioned Cristiano, and him and Pepe bring experience nobody else has, they are the two oldest players at the tournament.

"Then we have (the young players too)... we need all of this, they all need to be linked together, committed, that is crucial for us."