Manchester United boss Sir Alex Ferguson denies he's signed Fulham defender Chris Smalling as a replacement for Nemanja Vidic.

When asked about the signing, Ferguson attempted to stress that Smalling was a separate case - even though United will potentially have Rio Ferdinand, Wes Brown, Jonny Evans, John O'Shea and Vidic capable of playing centre-back.

"We've signed Smalling simply because he's a player of outstanding potential," stated Ferguson.

"That's the only reason. We recognise and identify players in that mould and we act.

"That's the reason.

"He has terrific height, good balance, he's quick, and at 20 years of age he has done exceptionally well for such a short period in the professional game. I don't see anything other than an outstanding prospect.

"That's the reason."