Prop Siate Tokolahi gets a start in the front row, with Ben Tameifuna moving to the bench, bringing to five the total changes from last week's Crusaders victory.
"You look at it a few ways," Rennie said of his selection to face the last-placed Force. "We're looking at picking a side that we believe will beat the Force but sometimes you've got to bring a bit of edge
"The guys who played last weekend, obviously you get up for those Crusaders games, they're big challenges. We've got other guys who want to come in and make a bit of a statement to say they're still here and ready to go."
Chiefs team to play the Western Force on Friday night:
1. Mitchell Graham
2. Hika Elliot
3. Siate Tokolahi
4. Matt Symons (c)
5. Brodie Retallick
6. Johan Bardoul
7. Sam Cane
8. Michael Leitch
9. Brad Weber
10. Marty McKenzie
11. Tim Nanai-Williams
12. Sonny Bill Williams
13. Charlie Ngatai
14. Bryce Heem
15. Tom Marshall
Reserves:
16. Quentin MacDonald
17. Pauliasi Manu
18. Ben Tameifuna
19. Michael Fitzgerald
20. Liam Squire
21. Augustine Pulu
22. Damian McKenzie
23. Andrew Horrell