Manchester United boss Sir Alex Ferguson has likened Real Madrid star Cristiano Ronaldo to a fine wine.

He joked on Sirius XM that Ronaldo was comparable to a rare bottle of wine.

"A '61 Petrus," he said when asked what the Real Madrid forward would be if he was a bottle of wine.

The Petrus vineyard produces a Bordeaux wine in limited numbers of bottles that can sell for tens of thousands of pounds.