Cristiano Ronaldo: Unhappy forward is ready to quit Real Madrid, according to Angel Di Maria

Former team-mate Di Maria says Ronaldo is 'not very happy' at Real

Ronaldo is increasingly disillusioned at the Bernabau (AFP)

Cristiano Ronaldo could follow Angel Di Maria out of Real Madrid. According to the Argentinian midfielder, Ronaldo is increasingly disillusioned at the Bernabeu and is aware that he is slipping slowly down the world's highest-paid players list.

Both Di Maria – and fellow Old Trafford newcomer Radamel Falcao – are believed to be now earning more than Ronaldo, not to mention Wayne Rooney who reportedly signed a £300,000 a week deal with United in February.

Di Maria, a close friend of Ronaldo who shares the same agent as the Portuguese superstar, said: "I don't know how much longer Ronaldo can put up with it at Madrid. I get the impression that he is not very happy."

Ronaldo is widely reported to be extremely disappointed with Madrid's transfer policy and had previously said: "I have a very clear opinion but I cannot always say what I think."

Ronaldo's agent, Jorge Mendes, said that he was well aware about his client's issues with Madrid.

"Ronaldo's comments are based on things I am aware of and he is at liberty to divulge them. These comments have not surprised me and certainly not upset me. "

Despite interest from Chelsea it seems that if Ronaldo does leave Madrid he will almost certainly head back to United who would welcome him back with open arms.

Ronaldo said this week: "I love Manchester. Everyone knows that. Manchester is in my heart. I left many good friends there. The supporters are amazing and I wish I can come back one day."

"He is a very good player – I think United did very well. He will be a fantastic buy. They need quality players. And Falcao is a quality player."