Red Devils manager says he was very impressed with the young defender's attitude in their 7-1 mauling of Blackburn, and was determined not to miss out on his signature
Sir Alex first noticed Jones last November when Manchester United hammered Blackburn Rovers 7-1, insisting that the youngster was exerting his influence on his team-mates even then.
He told reporters: "When he was playing against us in the 7-1 game, after the fifth goal he was running out and giving everyone around him stick and he was only 18 then. I was very impressed.
"After that I tried to get him last January. We put an inquiry in but Blackburn wouldn't sell him at that time."
"He was just one that we couldn't miss," Sir Alex added.
"He's definitely got all the parts to his game, there is no doubt about that.
"He has got the desire to play and he's a good trainer, with a great determination about him."