"I already worked at Real Madrid so for this reason I know the club well. He wouldn't find better conditions there than those which he already has," he told reporters in Lisbon later Monday, the Lusa news agency reported.

"Besides, he is part of the Manchester United family and he can become one of the club's symbols," added Queiroz who coached Real Madrid in 2003.

Spanish media have reported that the 22-year-old Portuguese international will be the big summer target for Real Madrid, who were also heavily linked to the player last year.

Ronaldo, whose current contract ties him to Old Trafford until 2010, has said in the past that he would like to leave England for Spain. He signed with Manchester United from Sporting Lisbon in August 2003.