Although he had played the 1995 World Youth Cup in central defence, a lack of height and fragile build meant that at senior level he was a specialist left-back.
Current coach Marcelo Bielsa took over after France 98, and Sorin was straight back in the squad.
But when Bielsa also opted to do away with specialist full backs, Sorin was relegated to the bench.
The player then set about convincing the coach that he could play in
He kept working on his game, and his introduction to the side
during qualification was the final, vital part in Argentina's jigsaw.
Bielsa's men had just been beaten by Brazil and outplayed by Paraguay.
In both games they had looked light in midfield, a serious deficiency for a side so committed to attack.
Sorin came in for the next match and has been undisputed first choice ever since.
Suddenly Argentina's blend was right.
With his scampering stamina, Sorin tightened the team's marking, while also charging forward to supply attacking options, and score important goals.
His value to Argentina's attack was emphasised once more in the recent friendly against Germany, when he cut in from the flank to head home the only goal of the game.
The combination of work-rate and basic technique make Sorin indispensable to Argentina's World Cup quest.
He has also proved - not least to himself - that he can adapt to life
He was concerned about the move to Brazil; not just because of his nationality, but also because he was a left-back going to a country that produces left-backs by the cart load.
But he quickly became an idol with the Cruzeiro supporters, a symbol of skill and will to win.
Sorin deserved to leave Brazil on a high note, and will seek to leave Japan on a note higher still.