The Warriors have lost forwards Jacob Lillyman and Bodene Thompson to injury ahead of Saturday's clash with Manly in Perth.
Lillyman and Thompson were both initially named to line up for the Warriors but have withdrawn with ankle injuries, with Lillyman picking up his injury in State of Origin III on Wednesday night.
McFadden named an extended bench for the trip with utility Tuimoala Lolohea joined by middle forwards Sam Lisone, Bunty Afoa, Charlie Gubb and James Gavet.
Utility Jazz Tevaga, who has made six NRL appearances so far this season, was added to the travelling squad.
The final make-up of the Warriors 17 will be confirmed an hour before kick-off on Saturday.