The AFLPA lawyers have read ASADA's interim report into Essendon's 2012 supplements program and will answer questions from the Dons' playing group at Windy Hill.
Finnis, who is yet to read the 400-page report, said he was encouraged that ASADA investigators had recognised "culpability at the end of the day must lie with those who are most responsible".
However, he could not guarantee players would escape without individual sanctions.
"I've got no information before me that would suggest that is going to happen, but clearly ASADA have labelled the report as interim, so I don't think we can rule that out," he said.
"That's unfortunate, but it's the reality.
"Now that the players' lawyers have seen a copy of the report, I'm sure the players will have some interesting questions for their lawyers in relation to where things go from here.
"Clearly it's an opportunity for us to provide an update to the Essendon players on the events of the last couple of weeks."
Finnis said he had not heard whether charges were going to be laid against Essendon as a club this week, and he was confident the AFL would not "pre-judge" the case before all parties had put their case forward.
He said any individual penalties that didn't recognise the faith Essendon players put in their doctors and high performance coaches could cause the public to lose faith in the system.
"Players do accept responsibility under the WADA code for the role that they play in ensuring that performance is clean," he said.
"But we've also got to recognise that players put enormous trust and faith in people who are going to have expertise in governing their supplements program.
"From the moment players come into the game, they're told to follow the directions of their club, the medical officers.
"Our players have done that. So I think any system that fails to recognise that in the way in which you respond to the situation, I think will lose public confidence."
Finnis was speaking at the launch of the 'Be the influence - Tackle Binge Drinking' initiative, alongside Collingwood star Scott Pendlebury and Richmond midfielder Daniel Jackson.
The initiative, launched at Melbourne's Wesley College, aims to address youth binge drinking and the influence of alcohol promotion on young Australians.
Pendlebury and Jackson both shared stories of how excessive alcohol consumption had changed their lives in late-night incidents.
Pendlebury was king hit when walking home from a Lakes Entrance hotel in 2008 after a night binge drinking.
Jackson meanwhile, witnessed a good friend's quality of life deteriorate after he was king hit in a night out that involved "too much alcohol and no plan".
'Be the influence - Tackle Binge Drinking' will be the naming rights partner of the 2013 AFLPA Most Valuable Player Awards on September 10.
Pendlebury will be joined by West Coast's Nic Naitanui and Adelaide's Patrick Dangerfield as key ambassadors for the program.
Nathan Schmook is a reporter for AFL Media. Follow him on Twitter @AFL_Nathan
