Some football matches are remembered because of a historic victory or a painful defeat. Others remain unforgettable because they change a player’s career forever.

For Mile Svilar, September 1, 2021 was that kind of night.

Serbia faced Qatar in a World Cup warm-up match in Debrecen, Hungary. Serbia won comfortably 4-0, and under normal circumstances, very few people would remember the game years later.

But for Svilar, it became the defining moment of his international career.

The 22-year-old goalkeeper came on at half-time for Predrag Rajković, making his senior debut for Serbia. At the time, nobody could have imagined that those 45 minutes would also become his final appearance for the national team.

Svilar was included in Serbia’s squads for four more World Cup qualifying matches after that game, but he never played another minute.

Five years later, the number remains the same: one senior international appearance for Serbia.

That is difficult to reconcile with his club career.

After establishing himself at Roma, Svilar went on to become one of the most highly regarded young goalkeepers in Europe and was recognised as Serie A’s best goalkeeper last season.

Yet internationally, his career remains frozen around that one evening in Debrecen.

Choosing His Father’s Country

Born and raised in Antwerp, Belgium, Svilar grew up surrounded by football. His father, Ratko Svilar, represented Yugoslavia, and his son followed him into the game.

Belgium was always an option, but the path to the senior national team was extremely difficult.

Thibaut Courtois was firmly established as Belgium’s first-choice goalkeeper. In 2021, Courtois was entering his prime and was already regarded as one of the world’s best.

Svilar never received a senior call-up from Belgium, although he represented the country 26 times at youth level.

At 22, he accepted Serbia’s approach and switched footballing allegiance, influenced by both sporting considerations and his family connection.

But Serbia presented another obstacle.

No Way Through in Serbia

Rajković was Serbia’s established No. 1, with Vanja Milinković-Savić also competing for the position.

After going through the complicated process of changing federations, Svilar may have expected to establish himself quickly. Instead, he found himself stuck behind the established goalkeepers.

His appearance against Qatar remained his only senior international game.

Still, he refused to give up.

After moving from Benfica to Italy in 2022, Svilar reportedly continued seeking permission from FIFA to change his international status again.

In 2024, then-Belgium coach Domenico Tedesco confirmed that Belgium had been following Svilar for months, but also made clear that the goalkeeper could not represent the country.

The interest was there. The rules were the problem.

Courtois Injured, But Svilar Still Could Not Return

Perhaps the cruelest moment came at the 2026 World Cup.

Belgium faced Spain in the quarter-final when Courtois was forced off with an injury. Sene Lammens replaced him in the 71st minute.

For Svilar, it must have been an agonising moment to watch.

Had he been eligible, that could have been the opportunity he had spent years waiting for.

Instead, he was unable to wear Belgium’s shirt.

Late in the match, a mistake by Lammens helped Spain take a 2-1 lead. Spain eventually went on to win the match and later lifted the World Cup.

Only Svilar knows what went through his mind watching that sequence.

The One-Way Rule

Svilar eventually decided that he no longer wanted to play for Serbia. He wanted to return to Belgium.

But FIFA’s eligibility rules had effectively closed that door.

Under the rule commonly described as the “one-way rule”, a player who switches federations and makes a senior appearance for the new country cannot simply return to the previous national team, whether that appearance came in a friendly or a competitive match.

That is exactly what happened when Svilar played for Serbia against Qatar in September 2021.

His route back to Belgium was effectively blocked.

A coach could call him. A federation could want him. The opportunity could even appear to be there.

But the door to the country he wanted to represent was locked.

That may be the cruelest part of a one-way ticket: you cannot change the destination, even after you realise you no longer want to stay there.

Serbia Still Had a Place for Him

Interestingly, Serbia did not necessarily close the door on Svilar.

In 2025, Serbia coach Veljko Paunović said he had spoken to the goalkeeper and that Svilar still had a place in the national team.

Paunović said Svilar had decided not to play for Serbia anymore, adding that he had tried to convince him that he was important to the team.

So Serbia could still welcome him.

The problem was that Svilar’s heart was elsewhere.

He wanted Belgium.

And Belgium was the one place he could no longer go.

A Decision Made on a Wednesday

According to a report by Gazzetta dello Sport, Svilar has not completely abandoned his hope of returning to Belgium even after another disappointment ahead of the 2026 World Cup.

His story is ultimately about a decision made at 22 that became impossible to reverse.

There was a sporting calculation. There was family heritage. There was the hope of becoming a national-team goalkeeper.

But one match changed everything.

On September 1, 2021, in Debrecen, Svilar came on at half-time against Qatar.

Serbia won 4-0.

He probably thought it was just another match—a chance to make his international debut.

He could not have known that those 45 minutes would eventually become both the beginning and the end of his international career.

For Mile Svilar, one match was enough to define an entire international story.