The only stumbling block over a possible deal is believed to be the fact that the Australian is currently halfway through serving an 18 game suspension for striking an opponent.
The matter it is now in the hands of the NRL who must decide over whether the punishment should be served in England if Williams does join the Broncos.
His management team recently attempted to register the 31-year-old with a French league team in an attempt to see his suspension served out, but this move was rejected by NRL officals.
Despite the uncertainty over his possible signing, London's coach Tony Rea is hopeful the back rower will be able to take his place in a new look Broncos squad for the 2005 season.
"Danny is an uncompromising character and will hopefully bring great spirit and knowledge to our team,� stated Rea on the club's official website.
"I see him playing a very important role for us not just on the pitch but in preparation and training as well."
"He added: "I think he could be really good for this place and his club ethic will be of great value.�
Williams' arrival at Griffin Park would take the number of new faces at the club to 11, with one more signing still yet to be announced.