Gabriel Jesus has been linked with a move to several big European clubs like Manchester United and Barcelona.
According to rumours, Mourinho has offered €38 million for the 19-year-old.
Neymar is now trying to convince the Palmeiras forward to join Barcelona.
He would like the Brazilian to play with him and said at a press conference:
"I spoke with Gabriel Jesus. Not only with him, but also told other players how it feels to play for Barcelona and to live in the city.
"He is a great player. We know lots of clubs want him. He needs to know the right moment to leave, we want the good players by our side.
"If he comes to Barcelona he will be very happy. Maybe we're the biggest club in the world. The city and the day-to-day are wonderful".