‘DWTS’ pro Lindsay Arnold suffers knee injury, may be unable to perform with Jordan Fisher

Bad news for Dancing With the Stars frontrunners Jordan Fisher and Lindsay Arnold going in to the semi-finals. 

ET can confirm that Arnold injured her knee during rehearsals on Sunday, threatening her ability to perform on Monday night’s show.

A DWTS source tells ET, “Lindsay injured her knee during camera blocking rehearsal Sunday morning while working on a number with the troupe. Lindsay is hopeful she’ll be cleared to dance tomorrow, but it will likely be touch and go until showtime Monday.”

ET can also confirm that Sharna Burgess is learning Arnold’s routines in case she can’t perform.

See photos of Lindsay Arnold and Jordan Fisher:

19 PHOTOS

Lindsay Arnold and Jordan Fisher together

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LOS ANGELES, CA – NOVEMBER 08: (L-R)Dancer Lindsay Arnold and singer Jordan Fisher attend the U.S. Premiere of Disney Pixar’s ‘Coco’ at El Capitan Theatre on November 8, 2017 in Los Angeles, California. (Photo by Barry King/Getty Images)

DANCING WITH THE STARS – ‘Episode 2508’ – The six remaining couples are prepping for a special night of dancing, in which they will perform two numbers – a regular couples dance and a special trio dance, in which one past season winner or finalist will be paired with each couple to compete, on ‘Dancing with the Stars,’ live, MONDAY, NOV. 6 (8:00-10:01 p.m. EST), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) LINDSAY ARNOLD, JORDAN FISHER

DANCING WITH THE STARS – ‘Episode 2508’ – The six remaining couples are prepping for a special night of dancing, in which they will perform two numbers – a regular couples dance and a special trio dance, in which one past season winner or finalist will be paired with each couple to compete, on ‘Dancing with the Stars,’ live, MONDAY, NOV. 6 (8:00-10:01 p.m. EST), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) CORBIN BLEU, LINDSAY ARNOLD, JORDAN FISHER

DANCING WITH THE STARS – ‘Episode 2508’ – The six remaining couples are prepping for a special night of dancing, in which they will perform two numbers – a regular couples dance and a special trio dance, in which one past season winner or finalist will be paired with each couple to compete, on ‘Dancing with the Stars,’ live, MONDAY, NOV. 6 (8:00-10:01 p.m. EST), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) TOM BERGERON, LINDSAY ARNOLD, JORDAN FISHER

LOS ANGELES, CA – NOVEMBER 06: Singer Jordan Fisher (R) and dancer Lindsay Arnold pose at ‘Dancing with the Stars’ season 25 at CBS Televison City on November 6, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)

DANCING WITH THE STARS – ‘Episode 2507’ – The eight remaining couples have spent the week learning all of the bloodcurdling tricks that it will take to treat the viewers to some terrifyingly fun dances, as Halloween Night comes to ‘Dancing with the Stars,’ live, MONDAY, OCTOBER 30 (8:00-10:01 p.m. EDT), on The ABC Television Network. ABC/Eric McCandless / ABC Via Getty Images) LINDSAY ARNOLD, JORDAN FISHER

LOS ANGELES, CA – OCTOBER 30: Singer Jordan Fisher (L) and dancer Lindsay Arnold pose at ‘Dancing with the Stars’ season 25 at CBS Televison City on October 30, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)

DANCING WITH THE STARS – ‘Episode 2506’ – The nine remaining couples set their sights on the glitz and glamor of Tinseltown as they dance to celebrate ‘A Night at the Movies,’ on ‘Dancing with the Stars,’ live, MONDAY, OCTOBER 23 (8:00-10:01 p.m. EDT), on The ABC Television Network. ABC/Eric McCandless / ABC Via Getty Images) TOM BERGERON, LINDSAY ARNOLD, JORDAN FISHER

DANCING WITH THE STARS – ‘Episode 2505’ – The 10 remaining celebrities will transform into some of the most magical Disney characters from their favorite Disney films and celebrate the magnificence of ‘Disney Night,’ on ‘Dancing with the Stars,’ live, MONDAY, OCTOBER 16 (8:00-10:01 p.m. EDT), on The ABC Television Network. ABC/Eric McCandless / ABC Via Getty Images) LINDSAY ARNOLD, JORDAN FISHER

DANCING WITH THE STARS – ‘Episode 2504’ – The 11 remaining celebrities wax nostalgic as they stroll down memory lane and celebrate with a dance to a time in their lives that left a lasting impression, as Most Memorable Year night comes to ‘Dancing with the Stars,’ live, MONDAY, OCTOBER 9 (8:00-10:01 p.m. EDT), on The ABC Television Network. ABC/Eric McCandless / ABC Via Getty Images) LINDSAY ARNOLD, JORDAN FISHER

DANCING WITH THE STARS – ‘Episode 2504’ – The 11 remaining celebrities wax nostalgic as they stroll down memory lane and celebrate with a dance to a time in their lives that left a lasting impression, as Most Memorable Year night comes to ‘Dancing with the Stars,’ live, MONDAY, OCTOBER 9 (8:00-10:01 p.m. EDT), on The ABC Television Network. ABC/Eric McCandless / ABC Via Getty Images) JORDAN FISHER, LINDSAY ARNOLD

DANCING WITH THE STARS – ‘Episode 2504’ – The 11 remaining celebrities rehearse for their stroll down memory lane as Most Memorable Year night comes to ‘Dancing with the Stars,’ live, MONDAY, OCTOBER 9 (8:00-10:01 p.m. EDT), on The ABC Television Network. (Paul Hebert/ABC via Getty Images) JORDAN FISHER, LINDSAY ARNOLD

DANCING WITH THE STARS – ‘Episode 2502A’ – With the first elimination having taken place on Monday, the 12 remaining celebrities ready themselves for one of the hottest nights in the ballroom – Latin Night, on ‘Dancing with the Stars,’ live, TUESDAY, SEPTEMBER 26 (9:00-11:00 p.m. EDT), on The ABC Television Network. Each couple will perform a samba, rumba, cha cha, Paso Dobl� Argentine Tango or salsa, vying for America’s vote. At the end of the night, the second elimination of the season will take place. (Eric McCandless/ABC via Getty Images) JORDAN FISHER, LINDSAY ARNOLD

DANCING WITH THE STARS – ‘Episode 2502’ – The 13 celebrities dance to some of the most classic ballroom styles that everyone knows and loves, as Ballroom Night comes to ‘Dancing with the Stars,’ live, MONDAY, SEPTEMBER 25 (8:00-10:01 p.m. EDT), on The ABC Television Network. Each couple will perform timeless favorites, including a quickstep, waltz, tango, foxtrot or Viennese waltz, vying for America’s vote. At the end of the night, the first elimination of the season will take place. ABC/Eric McCandless / ABC Via Getty Images) JORDAN FISHER, LINDSAY ARNOLD

NEW YORK, NY – SEPTEMBER 20: (L-R) Lindsay Arnold and Jordan Fisher visit Build Series to discuss the 25th season of ‘Dancing With The Stars’ at Build Studio on September 20, 2017 in New York City. (Photo by Noam Galai/WireImage)

LOS ANGELES, CA – SEPTEMBER 18: Dancer Lindsay Arnold (L) and singer Jordan Fisher attend ‘Dancing with the Stars’ season 25 at CBS Televison City on September 18, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)

DANCING WITH THE STARS – ‘Episode 2501’ – ‘Dancing with the Stars’ is back with a new, dynamic cast of celebrities who are ready to hit the ballroom floor and celebrate the show’s landmark 25th season. The competition begins with the two-hour season premiere, live, MONDAY, SEPTEMBER 18 (8:00-10:01 p.m. EDT), on The ABC Television Network. (Eric McCandless via Getty Images) JORDAN FISHER, LINDSAY ARNOLD

NEW YORK, NY – SEPTEMBER 06: Jordan Fisher and Lindsay Arnold pose at ABC’s ‘Dancing with the Stars’ Season 5 cast announcement event at Planet Hollywood Times Square on September 6, 2017 in New York City. (Photo by Bruce Glikas/Bruce Glikas/Getty Images)

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In a backstage video released by DWTS, the show’s physical therapist tends to Arnold’s knee.

“It felt like my whole leg gave out and stopped working,” the 23-year-old pro dancer says, describing her injury.

“It’s frustrating because it’s the semi-finals and I want to dance it with Jordan. And I hope this doesn’t stop me from doing that,” she adds, tearing up slightly.

RELATED: ‘DWTS’ Competition Heats Up After Quarterfinals Elimination– See Who Went Home!

Arnold and Fisher finished at the top of the judges’ leaderboard last week, with a perfect score of 60 points. They are slated to perform two dances Monday night. The first is an Argentine Tango set to the song “Brother” by NEEDTOBREATHE (featuring Gavin DeGraw). The other is a recreation of an iconic dance from a past season, in this case, Mark Ballas and Paige VanZant’s Jive to Tina Turner’s “Proud Mary.”

ET spoke with the top contenders last week, after their high-energy salsa alongside Corbin Bleu.

RELATED: Jordan Fisher & Lindsay Arnold Talk Landing Two Perfect Scores on ‘DWTS’ With Corbin Bleu (Exclusive)

“It was such a good night and it could have not happened to a more deserving person,” Arnold told ET about Fisher. “I mean that. It has been a crazy eight weeks. I am so, so grateful for every moment that we have had together, and having tonight was such a good night for us, and I am really, really proud.”

13 PHOTOS

‘Dancing With the Stars’ season 25 cast

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Sasha Pieterse

(Photo by D Dipasupil/FilmMagic)

Terrell Owens

(Photo by J. Countess/WireImage)

Barbara Corcoran

(Photo by Ilya S. Savenok/Getty Images for T.J. Maxx)

Vanessa Lachey and Nick Lachey

(Photo by Michael Tullberg/Getty Images)

Debbie Gibson

(Photo by Gabe Ginsberg/FilmMagic)

Drew Scott

(Photo by Noel Vasquez/Getty Images)

Frankie Muniz

(Photo by Adam Bettcher/Getty Images for Starkey Hearing Foundation)

Jordan Fisher

(Photo by Presley Ann/Patrick McMullan via Getty Images)

Nikki Bella

(Photo by Jim Spellman/Getty Images)

Derek Fisher

(Photo by Gabriel Olsen/WireImage)

Lindsey Sterling

(Photo by Josh Brasted/FilmMagic)

Victoria Arlen

(Photo by Phillip Faraone/Patrick McMullan via Getty Images)

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