But US Open officials leapt to his defence, backing up Lahyani's story, which stated he only left his chair to address fears that Kyrgios may have needed medical attention.
"I'm not sure it was encouragement", said Kyrgios after his win.
Lahyani came down from his chair and is said to have encouraged Kyrgios to show more effort when he was a set and a break down. "He just said that it's not a good look".
The weird scene went viral on social media as Lahyani addressed the 30th seed for almost a minute and at one point was heard saying, "I'm trying to help you". He said: "I don't really realise I think".
Herbert added: "I don't think he has to go down and take the position of a coach, like you see on the WTA Tour". You know, when I was up 40-0 at the end, I put my ear to the crowd, just want to hear them boo again.
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But USTA chiefs have undertaken a "comprehensive review" of the chair umpire's behaviour and decided that he will avoid punishment, despite accepting that his actions went "beyond protocol".
Djokovic, the sixth seed, struggled badly during his first round clash with Hungarian Marton Fucsovics, dropping a set before rallying to win in four after spending time in an ice bath during the mandatory 10-minute heat break.
Lahyani stood over the seated Kyrgios, berating the 23-year-old. "I got pissed off", said 2011 and 2015 champion Djokovic.
Nick Kyrgios, of Australia, wipes his face during a match against Pierre-Hugues Herbert, of France, during the second round of the U.S. Open tennis tournament, Thursday, Aug. 30, 2018, in NY. "I was a little bit surprised", he said.
'But everybody who knows Mohamed knows as well he's quite different from the others.
Kyrgios though played down the incident and denied Lahyani was "coaching" him during the drama-filled second set.
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Djokovic - the 13-time major victor seeking a third US Open crown - looked comfortable in the third, earning a match point as he appeared set to sweep the American in three sets.
"I felt like it's maybe one of these years where it could be hot", Federer said Thursday. "Obviously it's understandable. A chair umpire should be neutral", Djokovic told reporters. It's a conversation. Conversations can change your mindset.
"Not a bad performance by any means by me", Federer said.
"We don't know what would have happened if he (Lahyani) didn't do it".
"After seeing the video I am angry against the umpire", Herbert said. "I don't think he's a coach, he's an umpire, and he should stay on his chair for that". "He's the ultimate role model to anyone who wants to play".
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He then tweeted: "I shouldn't have tweeted so quickly after the match".