Celtic would then withdraw from the League in 1920, shortly after Ferris had scored their final goal of the season in a 1-1 draw against Glenavon.
[1] With Celtic not in action, Ferris signed for English side Chelsea in September 1920, scoring on his debut in a 3-1 defeat against Bolton Wanderers.
[2] He would go on to make 39 appearances for the Stamford Bridge club, scoring 6 goals in total before leaving for Preston North End in 1922.
Ferris was forced to retire from football in 1930 after being diagnosed with a heart condition,[1][6] but remained with Celtic in a scouting capacity, where he was credited with bringing Davy 'Boy' Martin[7] to the club.
[1] Ferris made his Ireland debut against England during the 1919-20 British Home Championship, scoring a 70th minute equaliser.