Carlos Alcaraz was forced to bring a practice session to an abrupt end with a sudden injury scare just two days before the start of the US Open.
But he insists he will be fit to play in the tournament at Flushing Meadows, live on Sky Sports from Monday.
Alcaraz revealed he "didn't feel comfortable" enough to continue training on Friday, after seeming to damage his ankle.
But later he declared: "I think it is okay. You know, I just stopped my practice just for precaution. I didn't feel comfortable enough to keep practicing just in case if everything is going to be worse.
"A few hours later, I'm still feeling good, you know, my feet, so tomorrow I will try to be practicing again 100% without thinking about it, but today I'll take care about it."
Two-time Wimbledon champion Alcaraz is looking to renew his fierce rivalry with Novak Djokovic at Flushing Meadows and has already won the US Open once before.
He has insisted that despite these precautionary measures, this injury scare will not prevent him from playing in the tournament.
"I wasn't worried at all for my US Open participation. Obviously I was angry because I don't want to stop the practice, just to respect [training partner Francisco] Cerundolo, as well," he said.
"I don't want to stop any practice. I want to practice, I want to get better, I want to get ready for the tournament.
"But honestly with the ankle, I wasn't worried about that. So I'm sure that tomorrow or in two days I'm going to be at 100%, for sure. It's about time."
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