Manchester United boss Sir Alex Ferguson says they won't spend for the sake of it this summer.

The United manager has already signed rising Mexican star Javier Hernandez from Chivas Guadalajara and defender Chris Smalling from Fulham, and a raft of new faces had been expected to follow.

But Ferguson will place his trust his existing squad and his latest crop of youth and reserve players if he is unable to pinpoint any new signings.

Ferguson said: "In the market today it's very, very difficult and the structure of our squad is good in terms of ages, the balance, the numbers and there's a lot of good young players.

"Sometimes you have to trust in all the development of the last few years and I'm going to stick with that, or most of it.

"There may be one signing and maybe we'd like to get a good player to the club, of course, but it's not easy in the present day climate and I've nothing definite to tell you because we're still assessing whoever's available and the difficulties in terms of who you'd bring in."