PSV Eindhoven star Cocu said: "Ferguson has pulled off a masterstroke. Edwin has the presence that a big team like Manchester needs, and they now have a much better chance of winning the title and the Champions League.
"I think Edwin is the keeper Ferguson has been searching for since he lost Peter Schmeichel.
"He is one of the best keepers in the world and I think the United fans will see him make many big saves."