Chelsea boss Rafa Benitez refused to stoke up his rivalry with Manchester United counterpart Sir Alex Ferguson ahead of today's FA Cup tie.
Benitez would not be drawn on the nature of his relationship with Ferguson.
"I am a manager and I just concentrate on doing my job," he said, before adding that he will not be joining his United counterpart for a glass of red wine post-match.
"We know that he has a good team so this will be a very difficult game. That is normal. When you're running a top side and you're playing against top sides, it's always difficult."