The Brazilian attacker had been linked with a summer move to Liverpool, with the Anfield club reportedly offering €20m (£17.1m) for the goalscorer.
However, it has been confirmed that the 24-year-old has signed for a further three years with the capital club.
“I want to thank the club for making me this offer,” he told their official website. “I want to spend much more time here and hope to become a much better player.
“I have been fighting for a long time to win the respect and affection of the fans, colleagues and people at the club.
“This is a very special moment for me.”
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