Simone Biles may be dealing with an injury as she competes for gold at the Tokyo Olympics

• Simone Biles may be less than 100% healthy heading into the Tokyo Olympics.
• The gymnastics superstar has been dealing with a lingering ankle injury in recent weeks.
• During Episode 5 of "Simone vs Herself," Biles said she's praying it holds up through the games.

The biggest star of the Tokyo Olympics may be injured heading into the games.

Simone Biles - the five-time Olympic medalist who is expected to once again dominate the gymnastics competition at the Olympics - is dealing with a nagging ankle injury. During Episode 5 of her Facebook Watch docuseries, "Simone vs Herself," the 4-foot-8 wonder explained that she had re-aggravated an issue with a ligament in her foot after she "landed short on a triple-double" during training in May.

"So right now, what we're dealing with is I just have a lot of fluid built up in there," Biles said during the episode, which was shot on May 24. "There's nothing we can do at this point. We don't have time for rest, we don't have time for shots and all of that stuff, so tape it is."

Ten days later, Biles won her seventh US all-around title at US Gymnastics Championships in Forth Worth, Texas. And three weeks after that, she took the top spot at US Olympic Trials in St. Louis, Missouri, to officially punch her ticket to the Olympic games.

The ankle didn't appear to slow her down. But given the difficulty of her programs - which could feature the unprecedented Yurchenko double pike vault and her eponymous skills on floor, beam, and vault - one false move could derail her progress once more.

"I always pray," Biles said on that day of filming after May's US Classic. "And I'm like 'Okay, just please let me survive these 11 weeks.'"

Check out the full episode of "Simone vs Herself" below: