Australia's Davis Cup captain Lleyton Hewitt has sprayed former team member Bernard Tomic, saying he was doubtful the former world number 17 would ever play in the Australian team again.

Appearing on Channel Ten's I'm A Celebrity… Get me Out of Here!, Tomic told other contestants he went on the show to find himself, having been struggling with life for some time.

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He reportedly asked the producers if he could leave the show to instead go and play tennis.

But Hewitt said Tomic had to commit to the sport and do many other things for him to even have a shot at coming back.

"We've made a lot of approaches and steps as part of Tennis Australia," Hewitt said.

"We can't do any more, believe me, the last two years has been hard work for a lot of people, we've bent over backwards to help Bernie in so many ways.

"At the end of the day you've got to want to help yourself as well, we can only hand out an olive branch and you've got to be willing to take that.

"He's digging a big hole for himself that he may not be able to get out of."

Hewitt's remarks come following a chequered year for the Australian tennis player, having come under fire for confessing he was a "little bit bored" during a straight-sets first-round defeat in Wimbledon last year.

Bernard Tomic's first-round loss at Wimbledon summed up his terrible year on-court in 2017. ( AP: Alastair Grant )

Tomic won only 10 out of 39 matches in 2017 and his ranking slid, meaning he had to go through a qualification tournament to try to earn a spot in the Australian Open.

When he lost to world number 218 Lorenzo Sonego, he made headlines again for attacking the media, saying that all he did was "count his millions" earned from tennis.

On Monday, Hewitt said he could not quite see a place for Tomic in the team as the squad geared up for the Davis Cup tie against Germany this Friday.

"I think with the team camaraderie that we have at the moment it's as good as I've been a part of in a long time, and we fully believe the players we've got here we can go a long way," Hewitt said.

"I don't watch a lot of those kind of shows but obviously a couple of boys have kept a close eye on it, it keeps them in good humour at night time.

"But it's strange — you either want to be a tennis player or you don't."