They will now face either Spurs or Burnley in the Wembley final on 1st March and Fergie has promised to include his first team youngsters in the squad for that match.
"The young lads have done fantastic to be there and they will play in the final, absolutely," he told Sky Sports after the win against Nigel Clough's side.
"I think that the important thing is to find out their temperament, and they've all proved that again.
"I think Wembley is a special place, our record in going to finals at Wembley is terrific.
"Just being there is always a great occasion, but you always want to win them because that's the only way you can enjoy it."