According to reports Gallen and the nine other players still playing in the NRL who were at the Sharks during their 2011 season which has been the focus of the doping investigation have accepted 12 month back-dated bans which will expire on November 21.
The ban effectively means those players - Gallen's Cronulla teammates Wade Graham, Anthony Tupou and Nathan Gardner, Newcastle's Jeremy Smith and Kade Snowden, Gold Coast pair Luke Douglas and Albert Kelly, and North Queensland back Matthew Wright will miss only three NRL games.
ASADA made the offer on Wednesday and gave the players 48 hours to reply, with the deadline for their response 9.30am on Friday morning.
The bans are set to decimate the Sharks side for their wooden spoon play off with Canberra at Remondis Stadium on Sunday, while Wright will be ruled out of the Cowboys' likely finals campaign.
In accepting the bans, the players must admit to taking banned substances as part of Cronulla's 2011 peptide program.
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These admissions are likely to be used as evidence against support staff.
The players are said to have agreed to the bans after WADA stated they were happy with them.
Super League players Paul Aiton and Ben Pomeroy are said to have rejected the bans.
The NRL is expected to release a media statement confirming the bans soon.
