Sir Alex Ferguson was full of praise for his young Manchester United side after their emphatic victory over Derby on Sunday.

The Red Devils eased to a 4-1 victory at Pride Park in the fifth round of the FA Cup.

United claimed the comfortable success courtesy of goals from Nani, Darron Gibson, Cristiano Ronaldo and Danny Welbeck.

Ferguson was delighted at the comprehensive nature of his side's performance and was particularly pleased with those who currently sit on the fringes of his first-team squad.

"We applied ourselves very well," the Scottish coach told MUTV.

"The players had a good attitude, they all wanted to play and that made the pace of the game really quick. I was very pleased.

"Nani's goal was marvellous and came at a good time for us, but he's capable of doing that.

"Danny is a natural finisher and his goals to games ratio is very good. He's only 18 but he's improving all the time."

The result could have been even more commanding were it not for a debateable first-half decision to rule out a Ronaldo effort.