A DEVASTATED Ben Cousins offered to take a drug test just hours after close friend Chris Mainwaring died after a weekend bender in which he allegedly took cannabis and ecstasy.

Cousins, who had visited his former Eagles teammate twice on Sunday, and left Mainwaring's Cottesloe home an hour before police and ambulance officers were called, offered to provide a sample to Eagles club doctor Rod Moore, who is also Cousins' family doctor.

Cousins was subsequently tested and the Eagles yesterday said the results were negative.

Mainwaring's father, Hubert, said yesterday his son had endured a bitter falling-out with Eagles hierarchy in the months leading to his death.

Hubert Mainwaring said he believed that the conflict over confidential information that his son had let slip to a colleague had prompted a descent into depression. It related to a major announcement the Eagles had planned to make about Cousins, who was battling drug problems.

"He (Chris) was told by (Eagles assistant coach) Peter Sumich that he had hurt the club and couldn't be trusted any more and Woosha felt the same way," Hubert Mainwaring claimed.

"They said he had broken their trust and let them all down, so he was shut off by the club, really, and things changed completely between him and the club. Not all the players stopped talking to him but a lot did … He was devastated that his old mates didn't trust him any more."

West Coast chief executive Trevor Nisbett admitted there had been tension between Mainwaring and his former club. "He did have a couple of guys in our club who did have some concerns over Chris' devotion to help Ben earlier in the year," he said. "That's a couple of people and he got over that."

Nisbett said Cousins was in great shape, despite persistent rumour and innuendo about his health. But the club was concerned as to how he would react to the death of his close friend.

"He (Cousins) has been doing everything that we have asked of him, and hopefully he will continue to do that. We were also concerned about him (Monday). He was with his dad and trying to come to terms with what had happened," Nisbett said.

"He knows he's not out of the woods; I've said that continuously. He's got a long way to go. He's working so hard at that and we're extremely proud of him at the moment."

Cousins, who was at the Mainwaring home on Sunday morning and then returned to bring his friend food that night, was back at the Haining Avenue residence for about an hour yesterday while Mainwaring's widow, Rani, was home. But he may also be asked to speak to the major crime squad, which is investigating the 41-year-old's death.

Police are hoping an autopsy will be carried out today, but were unsure whether they would would release the findings, which would include toxicology results.

Cousins is expected to attend the Eagles' club champion function on Friday night before leaving to resume treatment at a California rehabilitation clinic, the Summit Centre.

Nisbett suggested Cousins' presence alongside Mainwaring, described as a "troubled soul", was a testament to his loyalty. "I think what it says is that Chris may have experienced it (drugs) in a former life and consequently he was trying to help a friend at the start of the year. I think that is what it says," Nisbett said.

"He knew the dangers, trying to assist Ben to get him to rehab."

WEST AUSTRALIAN