[1] Tredinnick spent time as a child in Guyra where his father Alan was working as a teacher.
He later moved to Newcastle where he attended Booragul High School, alongside future teammates Brett Cowburn and Craig Johnston.
Tredinnick began his NSL career with Newcastle KB United in 1978.
He played for several clubs throughout his career, including Wollongong Wolves, APIA Leichhardt, Marconi Fairfield, and Heidelberg United.
He earned three caps for the Socceroos in 1983, featuring in matches against China, Thailand, and Singapore in the Merlion Cup.