Manchester United boss Sir Alex Ferguson says David De Gea is his No1.

The £18.3m Spaniard was replaced by Anders Lindegaard at Newcastle on Wednesday, following De Gea's costly blunders against Blackburn.

But ahead of today's FA Cup derby, Fergie said: "I know who I'll play in goal. De Gea is the long-term prospect. Anders has provided tremendous competition, but the potential of David is obvious."