Sir Alex went on record saying he expects to sign three players this summer while Gill said that it would be a busy summer.
David De Gea has supposedly already been bought to be the successor to Van Der Saar although Athletico deny this as they struggle to keep their squad together.
And the buzz in the papers and twitterverse is that the Ashley Young signing is imminent. United have also been linked with French youngsters Raphael Varane although I hope that would not be counted as one of three summer signings since he is more of a long term/developmental player.
I think United will push hard for a center mid, both Sneijder and Modric have been linked with a move to Old Trafford but I think Sneijder will prove to be too expensive not just in transfer fees but his salary is pretty damn high and Spurs aren't too keen on selling Modric. It will have to come down to either player forcing a move especially in Modric's case.
Ideally a proper destroyer CM will have to be bought. Hargreaves was supposed to be the answer but unfortunately his body did not cooperate. The Barca game highlighted United's lack of a true ball winner and although they were able to win the league without an Ince/Keane/Hargreaves type player not having one hurt in the final as well as the Man City/Arsenal/Liverpool games.
Jack Rodwell has been linked with a move but his price tag is high and he has never really proven himself a consistent force. It would be interesting to see how he develops under the guidance of Sir Alex but it seems like a steep price to pay for a player who hasn't proven a whole lot.