 Stacey made his Manchester United debut on 12 October 1907, playing at left back in a 6–1 away win over Newcastle United.That season, he made 18 league appearances and scored one goal as United won the First Division title by nine points over Aston Villa - the first major trophy in Manchester United's history.The following year, Stacey played more regularly at right back, playing in 38 matches on the way to the 1909 FA Cup title.