Novak Djokovic appeared to vomit into his towel after collapsing to his knees during his Cincinnati Open defeat on Saturday.The 24-time Grand Slam winner also opened up about a secret health battle he has been dealing with following his shock second-round exit.Djokovic very clearly struggled with his health at the Cincinnati OpenGettyDjokovic was dumped out of the event by unseeded Thiago Agustin Tirante, with the Argentinian winning 2-6, 6-4, 6-4.But his elimination was not solely down to his performance, as he majorly struggled with the high temperatures.In the second set of the match, Djokovic seemed to lose all of his energy and took a medical timeout on the court. He had his blood pressure checked by medics after appearing to throw up into his towel during a changeover.The 39-year-old, who was also sick during the Shanghai Masters in October 2025, collapsed to his knees in worrying scenes before walking over to his courtside chair, clearly struggling.And after the surprise loss to Tirante, in what was his first match since Wimbledon, Djokovic made an honest admission.What did Djokovic say about his health? Speaking following the match, Djokovic said: “First and foremost, I congratulate my opponent today.“Honestly, it hasn’t been a pleasant match for me. That’s how I’ve felt. It hasn’t been the first time, and it won’t be the last. That’s just how it is.”He then revealed: “The conditions aren’t the problem. It’s because of a health issue I have. I’ve been dealing with it for many years now.“It causes me a lot of problems, especially when there’s a lot of humidity and heat.View Tweet: https://x.com/hashtag/cincytennis?src=hash&ref_src=twsrc%5EtfwDjokovic admitted a secret health battle when speaking after his lossGetty“I️ knew these conditions were going to affect me, but there are other things too: the nerves and everything that comes with a match like this. “All of that makes the situation worse, and that’s what happened.”What next for Djokovic? After revealing his secret health troubles, Djokovic went on to admit that he will likely not play at the Cincinnati Open again.“It looks like I won’t be back, unfortunately, to play here,” he said.“It was a combination of the heat and humidity, all those things. Everything involved makes it worse.”There may now be concerns raised over whether Djokovic will be playing to the best of his ability at the US Open.Djokovic admitted that he’s unlikely to play again in the Cincinnati OpenGettyThe final Grand Slam of the year takes place at Flushing Meadows, New York from August 30 through to September 13.In fact, Djokovic will be in action on August 26 too, joining up with Women’s No.1 Aryna Sabalenka for a mixed doubles event.He will hope that he has overcome his health worries at the Cinicinnati Open before things get started later this month.