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.
Stacey's Manchester United debut took place on October 12, 1907, when he played at left back in a 6-1 victory against Newcastle. He participated in 18 league games that season and scored one goal as United won the First Division by nine points over Aston Villa, marking a significant milestone for the club.