A left half,[3] Low began his senior career with newly-formed Northern League club Aberdeen and was a part of their rise from the Northern League to Scottish League Division One during the early years of the 20th century.[4][5] He made 114 appearances and scored 30 goals during four seasons at Pittodrie and transferred to English First Division club Sunderland for a £400 fee in May 1907.[4] Low played eight seasons for Sunderland, before the suspension of league football in 1915 (following the outbreak of the First World War) ended his competitive career with the club.[4] During his time at Roker Park, Low made 228 appearances, scored 38 goals and was a part of the squad which won the 1912–13 First Division championship and reached the 1913 FA Cup Final.[3][4]
^Joyce, Michael (2012). Football League Players' Records 1888 to 1939 (Third edition, with revisions ed.). Toton, Nottingham: Tony Brown. p. 178. ISBN9781905891610. OCLC841581272.
^ abcdefghijk"Henry Low". Aberdeen Football Club Heritage Trust. Retrieved 12 March 2019.
^ ab"Harry Low". Sunderland Association Football Club. Retrieved 10 July 2020.
^The reference states they were half-brothers, but Willie was the son of William, a much older brother of Wilf and Harry – whose own father was also named William.