Scotland lost 3-0 to Brazil in Miami on June 24. Vinicius Jr scored twice, with Manchester United's Matheus Cunha adding the third as Brazil dominated.
Manager Steve Clarke acknowledged his team's mistakes: "We gave them the goals, we gave them the game. We made it difficult for ourselves," he told BBC Sport. John McGinn added: "We lose poor goals at poor times against a team that can punish you with quality."
With three points and minus-3 goal difference, Scotland's qualification now hinges on finishing among the best eight third-place teams. Their fate rests on results from other groups.
Scotland's last-32 odds have lengthened sharply following this loss; markets on their knockout progression now depend entirely on favorable third-place tiebreaker results elsewhere.