Bernard Tomic is "deliberately trying to damage" Australia's Davis Cup team culture, says Tennis Australia, who have withdrawn all his support.
Last month, Tomic accused team captain Lleyton Hewitt of ruining the national tennis system, after Hewitt alleged he had threatened him and his family.
Tomic, 26, said Hewitt was a "liar" and that "nobody liked him".
Tennis Australia chief executive Craig Tiley said he was "deeply disappointed" by Tomic's "ongoing disrespect".
Tiley added: "Lleyton is right to say Bernard will not be considered for Davis Cup. Bernard does not meet the standards of behaviour and commitment to himself, the team or the sport.