The 35-year-old scrumhalf, back home after a lengthy stint abroad in England and France, says this is a matchup that carries a little extra magic.
Reinach represented the Sharks from 2011 to 2017 before heading overseas, so this will be his first taste of the famous derby, which dates back to the classic Currie Cup days when Western Province and the Bulls battled it out in one of South Africa's fiercest rugby rivalries.
"I haven't played in South African derbies for a long time, and I've never played in this one," said Reinach, who represented the Sharks from 2011 to 2017.
"Just hearing the boys talk about it, you realise how big it is. It's going to be physical, it's going to be a full house, and it's a proper contest.
"The Lions [on December 20] was the first derby I had coming back and it's tough. You forget how tough it is to play against your own people."
Reinach said it's been great settling into Cape Town and reacquainting himself with South African culture after so many years abroad.
"I'm really happy to be here. The culture is something I've missed dearly, and the way the Stormers play suits me – fast, attacking rugby with quick ball."
At 35, Reinach is enjoying a bit of a career renaissance, fueled not only by his move to the high-flying Stormers but also by his emergence as South Africa's first-choice scrumhalf in 2025.
The explosive No 9 shows no signs of slowing down and is determined to keep performing at the highest level - with the Rugby World Cup in 2027 very much on his radar.
"You've got to look after yourself. Recovery, conditioning and being honest with your body – rugby doesn't stop," he said. "I still have goals. I want to contribute here, and I'd be lying if I said I'm not thinking about [the] 2027 [World Cup]."
With the Stormers flying high at the top of the URC table and the Bulls coming off a run of five straight defeats, some feel this weekend's derby might be a one-sided affair, but Reinach is having none of it.
"If you look at the individuals and the whole team, I don't think they're a weakened side or a weak side. I think they were a bit unlucky with a few games and one win and the whole thing turns around and the snowball starts going," he c
"We will have to be on top of our gaming in every department."
Stormers defence coach Norman Laker has raised eyebrows over SA Rugby's decision to deploy members of the Springbok coaching team to assist the Bulls in the build-up to Saturday's United Rugby Championship north-south derby at Cape Town Stadium.
Vodacom Bulls head coach Johan Ackermann has moved to address media reports surrounding his request to involve Springbok coaches with the team.
The Bulls are set to benefit from some invaluable Springbok coaching experience in the coming weeks.
Vodacom Bulls new attack coach Neil de Bruin says he has a spiritual bond with head coach Johan Ackermann and is looking forward to helping turn the team's fortunes around.
