In a 'Daily Telegraph' report quoting rugby player Tom Carter, who mentored Haddin and helped him get over the tough phase, it has been revealed that the wicketkeeper-batsman was on the verge of bidding adieu to the game after battling injuries and weight issues.
"He approached me after the T20 World Cup (in March) where he obviously had an incredible comeback through the Ashes and he just said, 'look, I feel really tired and I'm just unsure about where to go,'" said Carter, Haddin's friend for the last 10 years.
"I said to him, 'you have nothing to prove to anyone ... why don't we just train for a month and then you make a decision? Don't make a decision when you feel like you do now'," he recalled.
Carter said the 37-year-old managed to gather himself and come back.
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"And he just really picked up the bit there and ran with it. We've been working the last couple of weeks to try and help him get back for the Test and hopefully he becomes the 45th Test captain for Australia.
Haddin's self doubt reemerged during the recent series against Pakistan in the UAE where he suffered a shoulder injury.
"There was self-doubt about whether he'd be right. Again it was similar to post the Twenty20 World Cup. He obviously would have been disappointed with how his form was over there," said Carter.
"The bruising and the soreness of his shoulder was horrible, but the one thing from Brad is he never shows you pain. It just rolls off him and it was never going to be an excuse for him not to be ready," he added.