MANCHESTER, England : Ruud van Nistelrooy is well aware that his interim manager stint at Manchester United will be a short one, but the Dutchman said on Thursday that he expected to still be in charge for this weekend's Premier League clash at home to Chelsea. Former United striker Van Nistelrooy stepped up from his assistant coach role at the club after the sacking of Erik ten Hag on Monday, and Sporting coach Ruben Amorim is widely expected to be installed as manager at Old Trafford very