Bernard Tomic is unlikely to play for Australia again, the country's Davis Cup captain Lleyton Hewitt says.
Tomic, whose career has been affected by on and off-court controversy, failed to reach the Australian Open main draw but this week said the team could not win the Davis Cup without him.
The 25-year-old's world ranking has dropped to 168 after a slump in form.
"He's digging a big hole for himself that he may never get out of," former world number one Hewitt said.
When asked if Tomic might return to the Davis Cup team at some point, Hewitt replied: "It's highly doubtful.