By Scott Trotter Few managers have coached such an array of quality first-team players that they believe they can only guarantee a place for one in their ultimate team. That is the position Sir Alex Ferguson finds himself in when attempting to name his best-ever Manchester United side. The Scottish manager spent 27 years at Old Trafford and secured 13 Premier League titles, five FA Cup wins and two Champions League trophies in a successful tenure. Ferguson has coached some of the Red Devils’ greatest legends from Eric Cantona and Cristiano Ronaldo to Bryan Robson, Roy Keane and Wayne Rooney. T…