Chelsea defender David Luiz has warned Manchester United that his team is determined to add to its rival's misery when they clash in the FA Cup quarterfinals this weekend.

United is still reeling from its agonizing Champions League last-16 exit against Real Madrid on Tuesday and the fall-out from Alex Ferguson's surprise decision to drop Wayne Rooney for the showdown with the Spanish giant.

Several reports claim Rooney could be sold in the close-season as Ferguson no longer trusts the England forward to keep himself in shape, prompting Luiz to admit he would love to increase United's distress by knocking it out of the Cup at Old Trafford on Sunday.