(Reuters) – Manchester United’s U.S. owners have begun looking at options for the 20-times English soccer champions, including a new investment or a potential sale, 17 years after the Glazer family bought the club. The Glazer family is working with financial advisers on the process, which could lead to a partial sale of the Old Trafford club or investments including stadium and infrastructure redevelopment, the club said in a statement. Manchester United fans have been clamouring for a change of ownership and the Glazers have been the target of intense criticism as the team, which has a record…