It was the kind of friendly that might have faded into obscurity without much notice.

Staged early in the campaign versus Kazakhstan, recently affiliated with Uefa, the contest unfolded before a packed audience of merely 8,000 supporters and across a surface so worn that the turf required painting to enhance its look.

Yet that tight 1-0 victory in Chaves in northern Portugal has lingered in memory ever since.

The reason traces back to 20 August 2003, the date when Cristiano Ronaldo launched his senior Portugal national team journey.

Expecting the Madeira native to debut at the World Cup three years later would have seemed ambitious then, while forecasting a record sixth appearance in 2026 alongside Argentina's Lionel Messi and Mexico's Guillermo Ochoa would have appeared far-fetched.

Still Ronaldo, the record holder for international goals with 143, has reshaped Portuguese football by altering its mindset unlike any predecessor and, crucially, expanding what the whole nation viewed as achievable.

"We are a small country that seldom exerts worldwide influence beyond football," Joao Aroso, who collaborated with the forward at Sporting and the national side, told BBC Sport.

"Cristiano enables our small country to gain global recognition for excellence through the positive values he embodies."

In his prior five World Cups the star, now 41, always entered with an unassailable position. This summer will prove no different, though domestic debate over his function has grown sharper since Qatar 2022.

For years, challenging Ronaldo's inclusion publicly bordered on disloyalty. That has changed.

"He competes not to triumph but to dominate attention," contended Antonio Simoes, part of the Portugal squad that placed third at the 1966 World Cup.

"Do you see how this contrasts with Eusebio? Let us name it plainly. I hold no grudge. My vision, hearing and reasoning remain intact. Yet I must confront the facts as they stand."

Portugal coach Roberto Martinez has labeled the Ronaldo discussion as mere "lift talk".

Each time Martinez faces queries about the five-time Ballon d'Or recipient, he cites the identical figure across recent interviews: 25 goals across his last 31 outings for the Selecao.

"We speak of the finest player ever. He features here due to current elite output, not prior accomplishments," Martinez clarified.

Having netted in each of his five World Cups, Ronaldo gains another opportunity to silence doubters on the field.

The Al-Nassr forward holds eight World Cup goals, one shy of Eusebio's national mark, yet the true objective stands clear: guiding Portugal to its first title.

Ronaldo has already stated this marks his last World Cup.

Though no longer at physical peak, little question remains that Portugal will center on him as they open against DR Congo on 17 June.

"Cristiano grasps major occasions better than nearly anyone in the game," former Portugal international Abel Xavier told BBC World Service.

"Such experience may prove pivotal in a World Cup.

"His involvement matters greatly. Attention often turns to physical aspects, yet technical elements and especially mental strength count too. Younger teammates admire him and he consistently contributes to the group."

Former Portugal goalkeeper Ricardo, present for Ronaldo's 2003 debut and now part of the coaching staff, shares Xavier's perspective.

"Pace may have dipped slightly," Ricardo noted. "Rather than charging at 200km/h, he moves at 195km/h. That remains remarkably swift.

"While physical, technical and mental attributes persist, he stays a potent threat. With him, peril always lurks nearby."

Under Martinez, appointed in 2023 after departing Belgium, Ronaldo has appeared in 31 of the coach's 39 matches, with most misses stemming from injury or ban.

Portugal achieved their largest win of the cycle in one such absence, a 9-0 rout of Luxembourg in Faro during September 2023.

Their next biggest result, a 9-1 triumph over Armenia in Porto last November, also occurred without Ronaldo.

Predictably, talks resurfaced after both fixtures about whether the side functions better absent their skipper.

"He lacks the game to start for a squad aiming to claim the World Cup," remarked Sofia Oliveira, a pundit for CNN Portugal, DAZN Portugal and TSF radio.

"Yet it proves simple to enter this event and declare Ronaldo should not start, a view I share. The issue lies in the national team failing to prepare accordingly."

Managing an icon like this footballer was bound to prove challenging.

Fernando Santos understands this more than most.

After benching Ronaldo at the 2022 World Cup, the then manager encountered online criticism from the forward's relatives and departed his role soon after.

Questioned earlier this year whether he dreaded a similar outcome from an analogous choice this summer, Martinez downplayed the concern.

Ronaldo's influence in the nation runs so deep that Pedro Proenca, FPF president, needed to clarify in a SIC interview whether the forward would influence selection of Portugal's next coach should Martinez depart. Proenca rejected the notion.

With Ronaldo still in the squad, the FPF's February announcement of a tie-up with AVA CR7, a recovery firm owned by the player, sparked questions.

The federation maintains no conflict exists.

"The FPF considers this partnership fully compliant with relevant rules and free of any conflict regarding Cristiano Ronaldo's captaincy and playing status," the FPF stated to BBC Sport.

"It must be noted that Cristiano Ronaldo played no part in the talks, nor featured as a topic, with the entire process handled solely by AVA's leadership."

In recent months, as the ex-Manchester United and Real Madrid star approaches career's end, debate has increased over whether the FPF stands prepared for his exit.

In May the body passed its 2026-27 budget, forecasting record income of 161 million euros, after posting profit for the 13th straight year.

"The FPF approaches this transition without exaggeration. Cristiano will forever connect not to the federation but to Portugal itself," Proenca remarked at a recent gathering.

"The FPF has consistently planned for today and tomorrow. Naturally we recognize Cristiano's significance. The two brands intersect - Cristiano Ronaldo and the FPF - and honesty requires acknowledging that.

"What I can assure is that federation revenues stand secure to sustain a natural progression that will unfold smoothly, namely Cristiano's departure."

More than twenty years after that evening in Chaves, the forward remains central to Portuguese football. One last World Cup now beckons.