Squire's Tasman teammate, Shannon Frizell has headed for Japan after young flanker Luke Jacobson was ruled out of the tournament with delayed concussion symptoms.
Squire earlier cited mental health for his unavailability for the initial World Cup squad but said he would be available if someone got injured.
He is playing well provincially.
With Jacobson forced to withdraw, the 23-test loose forward would have appeared the obvious replacement.
Hansen, though, said nothing had changed since the World Cup squad announcement in relation to Squire.