By Jude Summerfield Ruud van Nistelrooy will not form part of Ruben Amorim’s coaching staff and leaves Manchester United after taking charge as four matches as interim manager. The legendary Dutch striker stepped into the Old Trafford dugout after Erik ten Hag was dismissed following a poor run of results, stopping the rot with three wins and a draw. Ruben Amorim was named Ten Hag’s successor earlier this month and will start work during the November international break. However, Van Nistelrooy has not been included in the incoming 39-year-old head coach’s support staff, with United revealing …