Former Toro Rosso Formula 1 driver champion Scott Speed will miss the final two rounds of Americas Rallycross due to a back injury he sustained at the Nitro Rallycross event.
Speed, the reigning ARX champion, currently leads the 2019 standings ahead of the penultimate round at Austin, but his seat in the Subaru Motorsports USA squad will be taken by World Rallycross title-contender Andreas Bakkerud for this weekend's event.
The Subaru team will also run a fourth ARX STI for 2014 Global Rallycross champion Joni Wiman.
"Having to continue the season with Scott watching from the sidelines will be tough," said Subaru of America motorsport manager, Bill Stokes.
"He has the team's full support and we're all looking forward to welcoming him back next season.
"At the same time, Andreas and Joni are two of the best rallycross drivers in the world - we're excited to bring them in to compete alongside Chris [Atkinson] and Patrik [Sandell], and put even more top-level rallycross talent in front of US fans."