Essendon chairman Lindsay Tanner has rubbished a report that cast doubt on the guilt of the 34 Bombers players banned for taking a prohibited substance because the drug only appeared on the ASADA watch-list the day before the club self-reported.

Tanner also told the Bombers' annual general meeting and members' forum on Thursday night that the board would not support a Senate inquiry into the supplements saga, as is the wish of some members and supporters.

Lindsay Tanner says the club will not be backing a Senate inquiry into the supplements saga. Credit:Eddie Jim

An October report from News Corp said documents revealed that Thymosin Beta-4 only appeared on the ASADA banned substances list the day before Essendon reported their supplements program to authorities in February 2013.

Some 34 Bombers players were banned for 12 months in 2016 by the Court of Arbitration for Sport for taking the substance during 2012.