The 30-year-old looked to suffer the blow at the NXT Live Event in Green Bay, Wisconsin, on Friday.
Kai was competing in a six-woman tag-team match alongside Kairi Sane and Candice LeRae against NXT Women’s Champion Shayna Baszler, Jessamyn Duke and Marina Shafir.
The New Zealander, real name Cheree Crowley, was in the ring throwing strikes when the incident happened.
She dropped to the floor with what looked to be an injury to her knee.
The referee quickly shot to Kai’s side and then threw up the “X” signal with his hands – a sign to medics that an injury has occurred.
They quickly decided Kai was unable to continue in the match as they helped her limp to backstage, with fans capturing the image on their mobile phones.
The bout continued as a regular tag match but fans are now waiting for further details as to the damage she suffered.
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Kai joined WWE in December 2016 and performs on both NXT and NXT UK.
Previously she worked for Shimmer Women’s Athletic, Shine Wrestling, Pro Wrestling Women’s Alliance, and Impact Pro Wrestling.
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