Sir Alex, "His performances have been very, very good. It's always a test for any player coming to United, but Carlos has given his own answer to that challenge in the way that he has played. We've been delighted with the lad. His attitude in the matches and in training has been excellent and we are very lucky to have him.
"All the evidence suggests they can form a really good partnership. We've had some fantastic partnerships at the club over the years and most of them took time to develop, apart from Cole and Yorke, who were terrific in their first season. Wayne is 22 this week and Carlos is 23, so both are young. They're showing great understanding already, but hopefully in three or four years' time we'll see something really special.
"Both have great attributes as strikers. Courage, speed, the ability to beat men, all those things are there. But maturity is the key. Once we see that, they will have greater authority and better timing in their game. Hopefully they'll still be at this club then and people will see what really special players they are. We hope they develop as a partnership and just get better. The signs are very good at the moment."