The 22-year-old East London-born will start at flyhalf at the Free State Stadium, in what will be the last fixture of the season for both the Isuzu Southern Kings and Cheetahs.
Winnaar, a former Dale College pupil, is a graduate of the old Eastern Province Academy under the auspices of current Isuzu Southern Kings Director of High Performance, Robbi Kempson.
He subsequently joined the Sharks in Durban in 2017 where he plied his trade until returning to his home province to join the Isuzu Southern Kings a fortnight ago.
Winnaar is one of a number of changes to the Isuzu Southern Kings backline this week.
Masixole Banda returns to the starting XV at fullback, where he replaces Ulrich Beyers. Fijian Meli Rokoua will start on the wing in the absence of top try-scorer Yaw Penxe, who is nursing a hamstring injury.
A new centre pairing will see Sibusiso Sithole partnering with Harlon Klaasen in the midfield.
While Winnaar will be playing his first match for the Isuzu Southern Kings, Michael Willemse will be making his final appearance for the team before heading off to Scotland for a new chapter in his career.
Willemse will be part of a forwards pack that will also see a couple of injury-enforced changes.
Dries van Schalkwyk will return to lock after appearing blindside flank in the side’s previous match against Ospreys two weeks ago. He replaces Stephan Greeff, who suffered a facial injury at training earlier in the week.
Openside flanker Stephan de Wit will earn a starting berth alongside blindside flanker, Tienie Burger. Andisa Ntsila, who started in the No6 jumper in the previous match, was unavailable for selection due to a rib injury.
“It’s been a tough week for us given the fact that this is our last game of what has been a long season. There were a few bumps and bruises that we had to sort out in the build-up to the match,” Head Coach, Deon Davids, said.
“There has also been a sense of excitement with everyone looking forward to this last one after all the commitment and hard work during the course of the past year. We just want to enjoy and express ourselves in a positive manner in our last game.
“The last week is always tough because certain guys will be staying behind, while others will leave the franchise… We’ve done our best this week to prepare to the best of our ability.”
The Isuzu Southern Kings will go in search of their first win over their local rivals in the Guinness PRO14 when the sides meet on Saturday.
The Port Elizabeth-based side is expecting nothing short of a hotly-contested battle between the two teams.
“We always give it our best shot. We always know that the Cheetahs are a tough opposition whether we play them in Port Elizabeth or Bloemfontein,” said Davids.
“If we want to beat them, we will have to be at our best. We will have to have all of our systems working, and we will have to be able to play beyond 80 minutes. That is exactly what we will try to do.”
The match kicks off at 17h30.
The Isuzu Southern Kings team is:
15 Masixole Banda
14 Meli Rokoua
13 Harlon Klaasen
12 Sibusiso Sithole
11 Bjorn Basson
10 Courtney Winnaar
9 Stefan Ungerer
1 Schalk Ferreira
2 Michael Willemse
3 De-Jay Terblanche
4 Andries Van Schalkwyk
5 John-Charles Astle ©
6 Stephan De Wit
7 Martinus Burger
8 Ruaan Lerm
16 Alandre Van Rooyen
17 Xandre Vos
18 Lupumlo Mguca
19 Schalk Oelofse
20 Jurie Van Vuuren
21 Rudi Van Rooyen
22 Bader Pretorius
23 Ntabeni Dukisa