Originally from Daylesford, Teasdale made his debut with the North Melbourne Football Club in 1956 playing as a ruckman and, for a period, a full-back.
Teasdale was noted for his tough, uncompromising play; and, in 1964, this almost cost him his life as his head clashed with that of North teammate Ken Dean, leaving him in critical condition with a fractured skull in St. Vincent's Hospital.
[1] Midway through that same year, just five weeks after the near-fatal injury,[2] Teasdale came back to play for North, wearing a protective head guard due to medical advice.
[3] He also was the acting captain in the absence of injured skipper Allen Aylett.
[5] His VFL career ended in 1967, and he later moved to Woodville Football Club, where he was captain-coach from 1968 to 1970 and then non-playing coach in 1971.