The Moto2 rider will partner Spain's Pol Espargaro, while Iker Lecuona has been promoted to KTM's satellite outfit Tech3 alongside impressive 2019 rookie Miguel Oliveira.
The five-time world champion, who could claim his sixth title at this weekend's Mexican Grand Prix, said he had to turn down a possible role in the soon-to-be-released 'Top Gun: Maverick' due to lack of time.
The move has been an open secret with Fernando Alonso entering rallies in South Africa and Morocco as preparation with fellow Spaniard and former Dakar motorcycle winner Marc Coma as co-driver.
It's down to the final four at Rugby World Cup 2019. England take on the might of the All Blacks while South Africa face a potentially tough encounter against Wales.
Scott Barrett was named at blindside flanker to better combat England's "kamikaze kids", the sole change to the starting XV that beat Ireland 46-14 in last weekend's quarterfinal.
The forward joined Chelsea from Borussia Dortmund for a fee of $71 million in the close season to become the most expensive American player in history but has struggled for minutes.
Sbu Nkosi replaces the inform Cheslin Kolbe who has not recovered sufficiently from the ankle injury he suffered against Canada and aggravated in the win over Japan.