A photograph of Ruud van Nistelrooy accompanied with the message ‘Welcome to United’… It feels like 2001 all over again. After 18 years away, the legendary striker returns to Old Trafford. This time around, his job will not be to bang in the goals, it will be to teach Rasmus Hojlund, Alejandro Garnacho and co the tricks of the trade he mastered during a prolific spell at Manchester United under Sir Alex Ferguson. Ruud Van Nistelrooy’s appointment as Man United’s new assistant coach was finally confirmed on Thursday. The former Premier League champion arrives alongside fellow Dutchman Rene Hake…