Rosenior says the Brazil striker has the potential to be one of the best strikers in the world.
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The manager stated: "Every player works on being the best player they can be, regardless of the role they’re asked to carry out.
"For Joao, he’s had real rhythm. I’ve asked him to do different things and he’s taken it on board and put it into practice. He’s been outstanding."
Rosenior continued: "The quality has never been in doubt. The true test for Joao now – which is the exciting thing – is if he can maintain this level of intensity and this level of quality, he can be one of the best strikers in world football.
"I truly believe that. It’s a possibility at the moment if he maintains this level."