Finnis said the report painted "a fairly scary picture" and he was appalled that the environment at Essendon from late 2011 to mid-2012 potentially compromised the careers and health of players.
The Players' Association did not become aware of what had taken place at Essendon until late last year and Finnis said it was apparent that the club treated its program as part of its intellectual property.
He said players were encouraged to buy into a culture of loyalty and therefore placed significant trust in coaches, doctors and other support staff.
"What we have to look at is, is that loyalty deserved? If people are going to breach that trust and confidence, which a player puts in them that loyalty ought to be questioned," Finnis said.
"At this stage the players continue to go about their job. They are focused on playing football but they are focused on complying and co-operating to the best they can with an investigation and I think that co-operation that they are providing goes to their sense of loyalty and their duty of loyalty to their club."
While he would not enter into any discussion as to whether heads should roll because of the failure of governance and practice at Essendon, Finnis said he had full confidence the Bombers would treat the issue with utmost seriousness.
"My discussion with [Essendon president] David Evans today gave me comfort that is the case," he said. "[We're] disappointed by the scope of the breakdown but encouraged by the recommendations."
In the edited report released today by Evans, the club admitted that many failures of process occurred in 2012:
"The rapid diversification into exotic supplements, sharp increase in frequency of injections, the shift to treatment offsite in alternative medicine clinics, emergence of unfamiliar suppliers, marginalization of traditional medical staff etc combine to create a disturbing picture of a pharmacologically experimental environment never adequately controlled or challenged or documented within the Club in the period under review."
The report made 12 general recommendations but did not name any individuals.
ASADA and AFL investigators are expected to begin interviewing Essendon players this week and the Players' Association will continue to provide legal advice and representation to them ahead of and during the investigation.
The AFLPA is also developing a series of initiatives to ensure players have a vehicle to express any concerns they have about club practices, including the development of a whistle blower program and encourage healthy questioning and vigilance among players.
Finnis told afl.com.au recently that players wanted the game's response to integrity to be focused on curbing cheating, as opposed to catching cheats.
"What should be not lost is the [need to] focus on the ethical health of the game and people making decisions within it," Finnis said.
"The issue has never been limited to the scope of the investigation which will determine whether or not specific supplements breached the provisions of the WADA code."
