Thiago made his debut for Brazil when they lost 1-2 to France on Friday.
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The debutant was not satisfied after the defeat, believing Brazil failed to play aggressively enough.
"We need to be more aggressive and we have to believe in ourselves more," said Thiago afterwards.
"We should not fear anyone. There are other people who have to fear us."
Thiago, 24, has scored 19 goals in the Premier League in the season.