Set to be named in the All Blacks' Rugby World Cup squad on Wednesday, Williams has also been included in the National Rugby League's team of the decade.
Williams, who played just two NRL seasons this decade with the Roosters, made the bench in the chosen 17 picked by a panel of 23 'legends'.
He won a premiership with the Roosters in 2013 and stayed with them the following year before returning to the All Blacks for the 2015 World Cup.
"Grateful and humbled to be named by legends of the game in the NRL team of the decade," Williams wrote on Twitter on Thursday.