Roy Keane immediately called out Gary Neville after his fellow Sky Sports pundit named two Manchester United legends as ‘teacher’s pets’ under Sir Alex Ferguson. Sir Alex Ferguson is widely considered one of the best managers of all time after his legendary career with Manchester United in England and with Aberdeen in Scotland. The 82-year-old Scotsman enjoyed incredible success in his illustrious managerial career, including lifting 13 Premier League titles and an iconic treble with United. Ferguson bowed of management in 2013 after he led United to their last Premier League title at the end …