After AFL chief Andrew Demetriou revealed that at least two players have stepped forward with information of potential "irregular practice" at clubs, Finnis went public in their support.
He pointedly called on players to speak out to authorities as league and Australian Sports Anti-Doping Authorities fully investigate mounting claims of possible substance abuse within AFL ranks.
Finnis reiterated strong claims from Demetriou, league investigators as well as national crime authorities that new regulations have moved beyond use of drug testing as a primary means of catching cheats.
"Gone are the days where you rely upon drug test samples to tackle performance enhancing drugs," Finnis said on Melbourne sports radio specialists SEN.
"If those players do have information concerns or issues they should feel duty bound to share that.
"So if players are taking advantage of that, then I think that's a positive thing."
Finnis has recently completed a nation-wide tour for meetings with players at all 18 AFL clubs as ASADA and league integrity investigators continue a widespread inquiry into all allegations of illicit drugs use as well as possible corruption through the league.