<text>  Barcelona legend Hristo Stoichkov has tipped Real Madrid to sell Cristiano Ronaldo to Manchester United if the price is right and claimed the world player of the year is tired of only being compared with Lionel Messi. The former striker was speaking in a Sportium promotion when he was asked about Ronaldo and he said: You would have to ask Florentino Perez about Ronaldos future. Sooner or later he will be sold by the president. Football is like that but it depends on the president. I dont know if he needs the money; if he does then it is a good moment to sell him. Hristo Stoichkov has claimed it would be a good time for Real Madrid to sell Cristiano Ronaldo . The former Barcelona and Bulgaria striker tipped Ronaldo to return to Manchester United . Stoichkov celebrates scoring for Bulgaria against Spain during Euro 96 in England . Stoichkov also claimed part of Ronaldos recent unhapiness stems from being tired of comparisons with Messi. He said: You cant doubt the quality of either one of them. Messi is where he should be but Ronaldo is in a delicate moment. All players go through bad moments, it happened to me too. Perhaps the obsession with Messi affects him. The difference between Ronaldo and Messi is he Messi gets compared with Pele, Diego Maradona and Johan Cruyff and Ronaldo only gets compared with Messi. Legendary Barca striker Stoichkov said he believed the BBC at Real Madrid - Gareth Bale Karim Benzema and Ronaldo - are not at the same level as Messi, Neymar and Luis Suarez. Stoichkov right is a legend at Reals rivals Barcelona, whom he helped to the 1992 European Cup pictured It has been rumoured that Ronaldo is unsettled at Real Madrid and may leave in the summer . Stoichkov suggested Ronaldo is tired of constant comparisons with Barcelona star Lionel Messi above They are low on morale, he said. Between the two forward lines Barcas is better at the moment and you always have to look to see if the players are enjoying themselves or not. Asked if he could see himself in Barca forward Suarez, Stoichkov said: He came with the label of problem player after the World Cup but I am convinced he will help them try to win the three competitions they are competing in. 