Ronaldo, who helped fire United to a Premier League and Champions League double last season, is a target for the Spanish giants, although several weeks of claim and counter-claim have failed to result in a deal.

United insist the Portugal international is not for sale while Madrid are waiting for the player to announce his future plans.

"If he leaves, Manchester United would lose the best player in the world," said Liverpool's former Madrid youngster Arbeloa.

"I would be delighted if Ronaldo leaves and more so if it is to my former team."

Arbeloa joined Liverpool last summer from Deportivo La Coruna and has faced the challenging task of marking the 23-year-old.

Ronaldo's departure would be a blessing for many Premier League defenders, according to the Spain international.

"Let's hope Real Madrid make an effort," joked Arbeloa. "For me it would be fantastic, I would thank them."