Reds coach James Horwill is confident that his captain James Horwill and scrumhalf Will Genia will both return from injury and play in the Super Rugby qualifying final against the Crusaders in Christchurch.
Both Horwill and Genia missed the Reds final regular season clash against the Waratahs but should return this Saturday.
Horwill is struggling with a calf injury and Genia is carrying knee and hand injuries.
"I expect Will and James Horwill will be okay by the time we get to the game," McKenzie said.
Super Rugby is in the knock out stage and a loss now will abruptly end the losing team's season.
Reds and Wallabies centre Anthony Faingaa is in doubt for the do-or-die clash due to a hamstring injury while Mike Harris (hamstring) and Rod Davies (knee) have both already been ruled out.
Flyhalf Quade Cooper says that he is looking forward to playing alongside Genia again after he missed out on the Test series against the British and Irish Lions.
"I'm very much looking forward having Willie back, he's an amazing player and we've played a lot of footy together so after him having a week off I'm sure he's going to be fresh," Cooper told Sportal.
"He was jumping out of his skin to play on the weekend gone but I think it was good for him physically and mentally to have a break."
While Cooper is expected to reclaim the Wallabies number 10 shirt for next month's Rugby Championship under new coach McKenzie he has played down his battle this weekend against All Blacks number 10 Dan Carter.
"Every game seems to be an audition because you've got to do a job for your club team to earn the right to get a call-up for your national side, so my sole focus is on doing a great job for my team and trying to progress us further in the finals," Cooper said.
McKenzie said that Cooper won't be distracted by any other matters and will be focused on the job at hand for the Reds against Carter's Crusaders,"I know the media gets excited about the head to head (contests) and I'm sure the players (think about it) somewhere in their mind but Quade will be 100 percent focused on how we want to play the game."