London - Manchester United manager Sir Alex Ferguson has warned his star striker Cristiano Ronaldo about his attitude, according to media reports on Sunday. The Portuguese winger, who has been strongly linked with a move to Real Madrid in the summer, has cut an increasingly frustrated figure this season and has been guilty of a number of acts of petulance.
His form has also suffered, and although he scored twice in the 3- 2 win over Aston Villa last week, it was his mistake that gifted Porto their opener in the 2-2 draw in the first leg of the Champions League last Tuesday.