The Portuguese player has been in fantastic form for the Red Devils, scording four league goals so far, and attributed his growth to the help from his countryman.
"Ronaldo has been a big help to me all the way through my career," Nani said, according to reports in the Daily Mirror.
"He gave me a lot of advice when I first came to Manchester when things weren't going so well for me. Since he moved to Real Madrid the support has continued.
"When we were with the national team, he said to me ‘you are in good form, now keep doing it because you are important for Portugal as well as Manchester United'.
"Yes, we are big friends. He can hear me out and listen so that's ok. Even though I am in Manchester and he is in Madrid he is always texting me and calling me to wish me well.
"Now, maybe United's fans are seeing the real Nani. They are happy with me and I am happy with myself - but I want to do even more."
Nani also gave manager Sir Alex Ferguson credit for his improved form.
"After I got injured at the World Cup, I came back stronger and with more confidence to play well and score more goals than last season," Nani added.
"I wanted to score more goals and get more assists and be in the team more and this has happened.
"The manager had a meeting with all the young players and he expressed how important we are to his plans.
"He also told us that we needed to keep improving because this is a big club and we have to be winning big trophies."To do that, he told us that every player on the pitch needs to think he can be the best in the world. He said we are here because effectively we are the best."
Nani added: "The younger players had to accept this responsibility.
"We have to be strong in our minds and when we get our opportunities on the pitch we have to think we can play well and be part of a winning team.
"Of course, I have been working hard to help my team win the games. Sometimes it is not possible to win every game, but I think my performances in the team have been very good."
Ferguson will certainly hope that Nani can keep to his current level of form, as United look to sew up their UEFA Champions League group qualification chances when they travel to Turkey to face Bursaspor later this week.
