"He needs to get some confidence back in his game as well as having the chance to play in his preferred spot in the halves.
"At the same time David has shown his ability in all the positions in the outside backs. He's been great on the wing and in the centres while he also brings a lot to the side at fullback."
The rest of the starting line-up remains intact for the match at Townsville's 1300Smiles Stadium, with rookie hooker Jazz Tevaga starting for the third straight week in the absence of the injured Issac Luke, and fellow dummyhalf Nathaniel Roache again included on the bench.
The only other change sees prop James Gavet added to the bench after a two-game absence for his ninth appearance of the year.
"James has been pushing to come back into the team with his form for our ISP side," McFadden explained.
"We're looking for a lot more from our forwards this week. We need to do much better in the battle in the middle in what will be a really tough game for us."
After consistently impressive defensive performances in nine straight games (six wins and three golden point losses), the Warriors found themselves down 31-6 at halftime against the Rabbitohs and despite an improved second-half showing could not overcome the visitors.
They now prepare for the trip to Townsville, one of the most challenging assignments in the game.
It hasn't been made any easier by the fact the 2015 premiership-winning Cowboys have lost their last three games and have won only six of their 10 matches since May to sit on 28 points, four outside the top four.
The Warriors beat the locals 20-16 in Townsville in 2014 and took a 24-22 lead into the last two minutes last April when the Cowboys broke their hearts with a late try to win 28-24.
The 2014 victory is their only win in Townsville in their last 10 matches there; their only match-up with the Cowboys this year has become critical to their finals hopes.
Overall the Warriors have an 18-17 win-loss record against the Cowboys but it's 5-10 in Townsville.
Cowboys v Warriors at 1300Smiles Stadium, Saturday, 9.30pm
Warriors: 1. David Fusitu'a, 2. Ken Maumalo, 3. Blake Ayshford, 4. Solomone Kata, 5. Manu Vatuvei, 6. Thomas Leuluai, 7. Shaun Johnson, 8. Jacob Lillyman, 9. Jazz Tevaga, 10. Albert Vete, 11. Bodene Thompson, 12. Ryan Hoffman (c), 13. Simon Mannering.
Interchange: 14. Nathaniel Roache, 15. Sam Lisone, 16. Ben Matulino, 17. James Gavet, 20. Bunty Afoa.