Cristiano Ronaldo
Cristiano Ronaldo was jeered by those in attendance at the Bernabeu on Saturday Getty

Super agent Jorge Mendes has ruled out the possibility of his client Cristiano Ronaldo ever rejoining Manchester United, insisting the Portuguese star will see out the rest of his career at Real Madrid.

Ronaldo left Old Trafford in 2009 for the La Liga giants, where he has broken every goalscoring record placed in front of him. But the reigning Ballon d'Or has seen recent performances come under heavy scrutiny amid an uninspiring start to the season.

The 30-year-old was jeered by supporters at the Santiago Bernabeu as Barcelona thrashed Real Madrid 4-0 on 21 November, furthering speculation over his future. Louis van Gaal then added fuel to the fire when he admitted United still have hopes of bringing the forward back to Manchester.

"We are looking at all players, not just Ronaldo. But these players are mostly ungettable. With Ronaldo, let's wait and hope," Van Gaal said.

Paris Saint-Germain have also been linked with a lucrative deal for Ronaldo, but Mendes remains adamant there will be no move for the player.

Speaking on French television show Canal Football Club, Mendes said: "It is impossible. He will end his career at Real Madrid."

Real president Florentino Perez told Cope in September that Ronaldo would not be sold for anything below his €1bn [£725m, $1.101bn] release clause. However, The Sun claims the Spanish giants would accept an offer closer to the £80m they initially paid for him in 2009.

Ronaldo remains a firm favourite at Old Trafford after spending six years at the club, during which time he won nine major honours including three consecutive Premier League titles and the Champions League.

Ronaldo has still managed to score 13 goals this season, but his strike rate has been on the wane in recent months. CR7 has found the back of the net just five times in his last 12 games, drawing a blank in key fixtures against Barcelona, Atletico Madrid and Sevilla, as well as against PSG in the Champions League.