The son of former Adelaide Crows coach Phil Walsh has pleaded not guilty to the murder of his father at his first appearance at the Supreme Court in Adelaide.

Cy Walsh was dressed in a green T-shirt and spoke only to acknowledge that he could hear the judge and also to enter his plea when he appeared by video link on Monday.

Adelaide coach Phil Walsh and his son Cy.

He is alleged to have murdered his father at the Walsh family home in Adelaide in July last year.

The court was told the case could still go to trial as prosecutors are yet to accept that the 27-year-old was mentally incompetent at the time of the alleged murder.

Past and present players from the Adelaide and Port Adelaide AFL teams are among more than 80 statements that have been taken.

The court received one report from the defence related to Walsh's mental health and will receive two more, a second from the defence and one requested by the prosecution, when the case returns to court on April 1.

AAP