Last November Williams signed a two year deal with the Wolfpack for a reported 10 million dollars.
The Wolfpack pulled out of this year's competition in July citing financial challenges from the Covid-19 outbreak, having failed to pay players, coaches and staff for several months.
New owner Carlo LiVolsi offered to underwrite the club's losses, but his plans were rejected at a meeting of the Super League clubs.
Wolfpack climbed from League One into Super League within three seasons of starting up, however they failed to win a game before their withdrawal from the competition during the Covid-19 shutdown.
Williams played the latter part of the NRL season with the Sydney Roosters.