The Manchester United boss reluctantly allowed Campbell to join the White Hart Lane outfit on transfer deadline day as part of the deal that saw Dimitar Berbatov move north for a club record £30.75m fee.

Although Campbell struggled to impress former boss Juande Ramos, he has been given his chance by Harry Redknapp and scored three times in two games as Spurs' revival gathered pace.

The 21-year-old also scored for England Under-21s in their victory over the Czech Republic at Bramall Lane on Tuesday, confirming he is a man in form.

Redknapp has spoken of his desire to sign Campbell on a permanent basis.

However, Ferguson has revealed a clause in the youngster's loan agreement that would allow him to go back to United in January.

"We could pull him back in January," said Ferguson. "We have to the option and it is a possibility.

"The boy has been fantastic at Spurs.

"He is a good player but we needed to get him first-team experience, so we agreed to it so the deal with Berbatov went through."