It comes just days after Tomic went on a blistering rant accusing Hewitt of corruption in his role as Davis Cup captain and saying several players don't anything to do with him.
Hewitt flatly denied Tomic's claim that he benefited financially from the players given wild cards for the Australian Open.
I think the threats that I've received for me and my family that I've had for a year and a half now ...
Tomic is no stranger to controversy after a series of run-ins with the authorities down the years. "I'd rather those guys got in a room and they sort it out privately. and I think there's a chance".
Hewitt won the US Open in 2001, Wimbledon in 2002 and helped Australia win Davis Cup titles in 1999 and 2003. "He hasn't been close to these in the last couple of years". "I threatened his family never", he told News Corp Australia and Hewitt called a "liar".
The 26-year-old said of the Australian captain that "nobody likes him anymore" and accused him of having a conflict of interest.
"I got nothing to do with your family and I don't care what's wrong with you, you liar".
Asked if the threats were physical or verbal, Hewitt said it was both.
"I've flown up to the Gold Coast trying to put teams around him, especially when things were hard in his family life", Hewitt said. He still kept making the wrong mistakes.
"What I want to get away from is the public tennis game, it being played out in the press", Masur told AAP.
"I probably took a lot for granted and I said regretful things in my own life about captains when things didn't go the way I wanted them to go".
"After the abuse I copped from him, I drew a line in the sand and haven't spoke to him since".
Kyrgios has since said he will make himself available for next month's tie.
Hewitt admitted he was most frustrated by how the incident had overshadowed the achievments of other Australians at their home Slam and labelled Tomic a "clown". I only saw it as a player.