Manchester City boss Pep Guardiola says skipper Fernandinho has taken Kayky under his wing.
Guardiola says it will take time for the new recruit to adapt to life in Manchester, as he looks to get to grips with a new country, culture, language and footballing style.
"He's so young," Guardiola said of Kayky. "It's a new country - completely different than Brazil.
"When Fernandinho came, he came from Shakhtar Donetsk, when Gabriel Jesus came, he was a big star playing big moments in Brazil.
"He needs time - to train and settle with his family. It will be step-by-step. After, what he will show on the pitch will dictate everything.
"It depends on him but he has help from the Club. We support him and Fernandinho is helping him a lot as he always does.
"He knows the Club. He didn't come for a short period but he has to settle into the rhythms and what we want, and adapt in his development as a player.
"He's still young but he has everything to improve."
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