Post-playing
Brentnall retired from playing after the 1983 NSWRL season at the age of just 26 to take up the position of RL development officer in the Riverina for thirteen years.
Brentnall joined the newly-formed Melbourne Storm as assistant coach under former team-mate Chris Anderson. Later appointed football development manager, he continues to work there and the club have honoured him by naming the young achiever (under 18 player) trophy after him. He was also appointed chairman of the Victorian Rugby League.
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