Collingwood defender Sam Murray is under investigation from ASADA, and could face a multi-year ban for allegedly testing positive to an illicit drug on game day.

Murray was withdrawn from Collingwoodโ€™s win over Port Adelaide last weekend for what the club described as โ€œpersonal reasonsโ€ although he did face Brisbane the week before.

The Herald Sun are reporting the Pies have not been answering calls since Thursday night.

MORE TO COME.