In the weeks and months leading up to the final, such an outcome had appeared improbable. With Romero stuck on the bench at Monaco and Malaga's Willy Caballero impressing in La Liga, there were calls for a change between the sticks ahead of the World Cup.
But Alejandro Sabella stood firm. The Argentina boss was asked about the goalkeeping situation on numerous occasions but his answer was always the same. "I have to make the decision," he said. "And I'm sticking with the same three goalkeepers: Romero, [Agustin] Orion and [Mariano] Andujar."
So far, that trust has paid off. Romero made several important interventions to keep Argentina on level terms against Iran in the group stages, including one stunning save from Ashkan Dejagah before Lionel Messi won it for the Albiceleste with a superb strike in added time.
"I was very happy with the performance of Romero against Iran. In a World Cup, when you have a player like Messi who can win you any game, plus a goalkeeper who is growing with each match, that's very important," Diego Simeone told Goal in his column as a Sony World Cup ambassador after the Iran match.
DECISIVE | Romero and Messi embrace after their side's semi-final successRomero conceded twice in the 3-2 win over Nigeria and once in the 2-1 victory against Bosnia-Herzegovina, but has now kept three clean sheets in the knockout stages and was the hero for Argentina with his shootout saves on Wednesday.
"Hands of God," was the headline on the cover of one Argentine newspaper following those heroics after Romero was decisive against Netherlands, evoking memories of Sergio Goycochea's penalty saves against Yugoslavia and Italy en route to the World Cup final 24 years ago.
"Romero was decisive and I'm so happy for him. He was a team-mate of mine at the end of my career at Racing and he's humble, hard-working – a great person," Simeone told Goal in his latest column. "Sabella kept faith in him and that confidence, that continuity and even bravery to stand by a player who didn't have the opportunity to play often at Monaco last season, has all paid off."
And he added: "At a tournament like this one, if your goalkeeper is on form and your most decisive player is also on form, that gives you confidence at both ends of the pitch."
So as they prepare for their most important match since the 1990 meeting with West Germany in Rome, Romero's form and Messi's magic give Argentina added confidence and two big reasons to believe in a third World Cup win on Sunday.