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While the 24-year-old admitted his goal was nothing sensational, he says he was elated to score his first World Cup goal.
"To score my first goal for Argentina, and for it to come at the World Cup and to secure three points for us – that’s what dreams are made of,” he told Fifa's official website.
"I couldn’t ask for more, although it wasn’t a particularly beautiful goal."
Following narrow wins against Bosnia and Herzegovina and Iran, the Sporting Lisbon defender believes his side showed a lot more attacking threat against Nigeria.
"Today, we were clearly a lot more inspired going forward. Our attacking players helped us out by scoring quickly. You always feel a bit more comfortable in a winning position.
"The key factor in our improved performance today was an increase in space, because Nigeria were attacking and trying to win the match.
"That inevitably makes the match more open. And we knew that if we had more space available to us than in the first two matches, we’d create more chances."
Argentina will face Group E runners-up Switzerland on July 1 at the Arena Corinthians, Sao Paulo, in the last-16 stage of the competition.