The Warriors boarded a private flight to the New South Wales town of Tamworth as the NRL plans to restart the coronavirus-hit 2020 season on May 28.
However, an "unwell" Roache was not on the flight from Auckland after contacting medical staff on Sunday morning.
Warriors centre David Fusitu'a also remained in New Zealand on compassionate grounds.
They're en route to Tamworth but David Fusitu'a and Nate Roache delayed.#ALLIN
