Derby County manager Phillip Cocu says facing Manchester United in the FA Cup will be special for all involved.

Wayne Rooney will be reunited with his former club after Derby beat Northampton 4-2 in their fourth round FA Cup replay on Tuesday night to set up a fifth round clash with United and Cocu believes an upset could be on the cards.

"I think not only for Wayne, of course for him it's a special game but I think for everybody at the club and in the team," Cocu said after the game.

"We knew if we win the game we would play Man United here at home, so that was a bonus. A great game to look forward to, we have a month but a beautiful game, so we'll enjoy it and also, of course, try to win it against a strong opponent but in football nothing is impossible."