The Austrian venue is scheduled to host a women's giant slalom competition on October 17.

Shiffrin revealed she will be forced to sit out the season-opening race after tweaking her back last week.

"As most of you probably know (if you don’t then mark your calendars now!) the @fisalpine World Cup opener at Soelden is just over one week from today, but much to my disappointment, I will not be able to start this year," Shiffrin wrote on Instagram.

"After tweaking my back skiing last week, I have been advised to sit Soelden out to let my back heal so I can race the rest of the season.

"Having started in Soelden for the last eight years straight, this feels...really frustrating and strange (for lack of better words).

"Luckily, this injury will heal and I will be back in the start soon... (and I can’t wait).

"While this is a bummer to not be racing myself, I am super psyched to watch my teammates compete.

"They are looking strong, fast, and fired up.

"I’ll be cheering as loud as I can for our US women and men next weekend and I hope you will be too!

"I want to thank everyone, from my sponsors to the media, to the fans, the @usskiteam staff and my teammates, and especially my hometown community, family and friends, for your support in this whole process and for helping me get back out there doing the sport I love."

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As most of you probably know (if you don’t then mark your calendars now!) the @fisalpine World Cup opener at Soelden is just over one week from today ??... but much to my disappointment, I will not be able to start this year?‍♀️. After tweaking my back skiing last week, I have been advised to sit Soelden out to let my back heal so I can race the rest of the season. Having started in Soelden for the last eight years straight, this feels...really frustrating and strange (for lack of better words). Luckily, this injury will heal and I will be back in the start soon... (and I can’t wait?). While this is a bummer to not be racing myself, I am super psyched to watch my teammates compete. They are looking strong, fast, and fired up ??. I’ll be cheering as loud as I can for our US women and men next weekend and I hope you will be too! I want to thank everyone, from my sponsors to the media, to the fans, the @usskiteam staff and my teammates, and especially my hometown community, family and friends, for your support in this whole process and for helping me get back out there doing the sport I love. YA’LL... this is HAPPENING. With all the uncertainty throughout this year, we are only ONE WEEK (and a day) away from the start of the World Cup season and that is something to be really excited about??. Okay, maybe my countdown has been delayed, but the big countdown is ON and I can’t wait for it to start. I’m wishing the best to everyone racing in Soelden, and I’ll see you all soon??. (?: Dad?)

A post shared by Mikaela Shiffrin ⛷? (@mikaelashiffrin) on Oct 9, 2020 at 4:58am PDT

Shiffrin last raced on January 26.

The 25-year-old spent a month away from the skiing circuit in February and March following the sudden death of her father Jeff.

She had planned to participate in one final event before the end of the 2019-2020 season, a World Cup meeting in Åre in Sweden.

Due to the coronavirus pandemic, the race and the remainder of the season was cancelled.

Shiffrin has been the dominant force in recent years on the women’s Alpine skiing circuit, with the American having claimed the overall World Cup title on three occasions.

She has won 66 World Cup races in her career, the second most by a woman after fellow American Lindsey Vonn who has 82.

The second race of the season is expected to take place on November 13, with Lech in Austria due to host a parallel giant slalom event.

Shiffrin won the Olympic slalom title at Sochi 2014 and the giant slalom crown at Pyeongchang 2018.

In addition, Shiffrin has won five world tiles.