"So a win will do us - if we get a bonus point we'll be even happier - but a win is essential from a tour point of view."
Rennie has entrusted that task to the players who rescued a share of the spoils against the Bulls.
Gareth Anscombe, Tim Nanai-Williams and Augustine Pulu have all been promoted to the starting line-up, with Mils Muliaina, Anton Lienert-Brown and Tawera Kerr-Barlow dropping to the bench.
"It's certainly a reward for their injection into the game," Rennie said. "[Pulu] started against the Crusaders and injured his knee, so we've weaned him back in. There's good competition at 9 for that starting spot ... it means both those boys have got to front pretty well to fend the other one off.
"And likewise with Tim and Gareth - they were great off the bench last week and I'm expecting them to start like that this week."
The loose forward trio is the other area to undergo an overhaul, with Michael Fitzgerald starting at blindside flanker, Liam Messam moving to No8 and Sam Cane switching in for Tanerau Latimer.
That leaves the tight five unchanged and gave many of those in the lineout mix the chance to improve on a substandard performance against the Bulls.
"It was tough for [hooker] Rhys [Marshall] last game from a lineout point of view," Rennie said. "We had a good look at our lineout and we've made some shifts to make the job a little bit easier on our hooker. There's been an enormous amount of work gone in over a number of weeks but, in the end, we've got to get a better result."
Rennie knows his charges need to take a step forward from last weekend. "The attitude was sensational coming back, so we were really happy with the effort the boys put in. But we need to be a lot sharper in other areas."
Chiefs team to play against the Cheetahs tomorrow morning:
1. Pauliasi Manu, 2. Rhys Marshall, 3. Ben Tameifuna, 4. Matt Symons, 5. Brodie Retallick, 6. Michael Fitzgerald, 7. Sam Cane, 8. Liam Messam (vc), 9. Augustine Pulu, 10. Aaron Cruden (c), 11. Asaeli Tikoirotuma, 12. Tom Marshall, 13. Andrew Horrell, 14. Tim Nanai-Williams, 15. Gareth Anscombe.
Reserves: 16. Nathan Harris, 17. Jamie Mackintosh, 18. Josh Hohneck, 19. Liam Squire, 20. Tanerau Latimer, 21. Tawera Kerr-Barlow, 22. Anton Lienert-Brown, 23. Mils Muliaina.