A Manchester United legend in the iconic treble-winning squad has pinpointed the exact moment that he knew his career at Old Trafford had come to an end. Sir Alex Ferguson’s legendary Manchester United team of the past became the first English side in history to complete a continental treble in football. United narrowly edged out Arsenal to the Premier League title by a single point in the 1998-99 season before beating Newcastle in the FA Cup final. The Red Devils completed their historic treble with a famous Champions League win over Bayern Munich at the Camp Nou in Barcelona in 1999. Teddy S…