Cunha scored his first goal for United in victory over Brighton on Saturday.
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And The Sun says Fernandes has been credited for the way Cunha has now settled at Old Trafford.
The pair work hours together in extra training sessions at Carrington and Fernandes also offers Cunha advice on how to handle the pressure of being a Manchester United player.
Fernandes also acted as a sounding board during Cunha's spell on the sidelines due to injury.
United go to Nottingham Forest on the weekend after winning their past three Premier League games.