A former AFL player who killed two elderly women in a car crash while driving under the influence of drugs with his daughter in the vehicle will spend at least eight-and-a-half years behind bars.

Shannon John Cox, 39, admitted unlawfully killing Thelma Clausen and Coral Seinor after he fell asleep at the wheel and crossed into the path of oncoming traffic about 170 kilometres north of Perth on June 7 last year.

The women, who were in their 80s and on their way to a Country Women's Association event, suffered significant injuries in the head-on collision and died at the scene.

Cox, who played 25 AFL games for Collingwood between 2007 and 2009, had 0.77 milligrams per litre of methamphetamine in his system and was suffering from fatigue, Western Australia's Supreme Court was told today.

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