Manchester United chief executive David Gill has hailed the club's scouting system over the success of their signings this season.
"We've worked very hard over the last few years to make sure the signings are right," said Gill on MUTV. "That's testament to Sir Alex Ferguson, Carlos Queiroz, (chief scout) Jim Lawlor, the scouting system and our ability to identify players who are going to make a difference.
"The team last year (2006/07) won the title fantastically, so the challenge was how do you improve on that? But that's what we've tried to do, to make sure we don't stand still but progress. Sir Alex will never let us rest on our laurels and if we can improve the squad this summer, we will certainly be in a position to do so."