Hewitt did not go into detail other than to call them "blackmail threats and physical [threats]".
After losing his doubles match yesterday, Hewitt said he is no longer on speaking terms with Tomic following alleged abuse at the hands of the Wimbledon quarter-finalist over the past year or so. "I spent a lot of time with him one-on-one at a lot of tournaments and tried to get a coaching structure and physical team around him to give him the best opportunity".
Hewitt also said Tomic will "never" play Davis Cup again.
I think the threats that I've received for me and my family that I've had for a year and a half now ...
To make things even worse, Kyrgios will probably skip the upcoming Davis Cup tie against Bosnia and Herzegovina, not being on the same side with the captain Lleyton Hewitt for quite a while now together with Bernard Tomic and Thanasi Kokkinakis.
"Blackmail threats and physical", and revealed they have been made against him and his family.
In a media conference following Hewitt's loss in the Australian Open doubles competition, the two-time Grand Slam victor also fielded questions about Tomic's accusations that Hewitt was giving preferential treatment to other Australians when it came to Davis Cup selections and whether he had a conflict of interest within Australian tennis.
'You're not playing, bro.
"Nick and I have had a great relationship ... but standards have to be set".
Hewitt asserted that he didn't feel particularly threatened by the threats, and that he felt they were empty.
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We got a good start as well so it's the sort of win that will give the team a lot of confidence, chasing 300. He has been captain of the (Melbourne) Stars, he has got good leadership qualities as well.
He was responding to Tomic's claims this week that Hewitt had ruined the national system and "no one likes him any more".
Hewitt added: "I don't know why Bernie's Bernie".
"... We see it in all different sports as well and all I want guys to do is commit to the sport and work hard and want to play for Australia".
"Go away, like literally, if he's retired, why are you still in tennis?" he continued.
The captain added in reference to Kyrgios' Instagram offering: "That is one of the standards, absolutely ... that we can't put up with for the culture of Australian tennis - we can't do it". Tomic has not played for his country in the competition since 2016.
'We feel like we have a responsibility to set a cultural standard and right now Nick's not meeting those either, ' Hewitt said. I've always wanted to play Davis Cup.
Bernard Tomic during his match against Marin Cilic of Croatia during day one of the Australian Open tennis tournament in Melbourne.
Describing him as a "clown", he said he was disappointed by Tomic's most recent comments.
Hewitt also criticised Kyrgios's controversial Twitter posts, which included a furious attack this week on the experienced Australian coach Roger Rasheed. We have some exceptional players doing some exceptional things here.