He had an exceptional 2017, winning seven titles, including two Slams - the Australian Open and Wimbledon.
Djokovic will play two matches at the Kooyong Classic exhibition event as he recovers from the elbow injury that has kept him out of action since July.
"It's their view and I've never needed the help of Tennis Australia to achieve what I've achieved in my career".
Doubt was cast over whether Djokovic would be fit to play in the Australian Open, which starts on Monday, when he withdrew from warm-up events in Abu Dhabi and Doha after feeling pain in the elbow.
Nadal enjoyed a resurgence of his own to succeed at the French Open and US Open, although he has struggled with a knee injury ahead of the tournament.
"Nadal, he's No 1 in the world and made the finals a year ago - I don't think I would be ahead of him as a favourite. For now everything at the moment is going in the right direction", the Serbian star said on Thursday.
Cabrera was awarded a wildcard into the Australian Open draw last week and the world No.152 will chase her first win on Australian soil this summer when she faces off with world No.71 Maia.
Federer also has Milos Raonic, Juan Martin del Potro, David Goffin and Tomas Berdych in his quarter of the draw, while Nadal would appear to have the easier section, although former U.S. Open champion Marin Cilic looms as a last-eight opponent. The previous year I was playing only Futures, now I'm playing this year a Grand Slam and I'm really focusing on Challengers, so it's a very big progress for me and I'm happy about it.
Of course, British fans want know if this will be the year when Johanna Konta [25.0] takes a giant leap and wins her first Slam. The two modern day greats who squared off in an epic in last year's final will once again have an opportunity to add another chapter to their famous FEDAL rivalry.
However, perhaps the most significant indicator of who could shine brightest in 2018 came in October when Caroline Wozniacki battled to a maiden WTA Finals title, displaying a new brand of ruthless tennis that suggested a first grand slam was imminent.
The world No. 19 will play in her first home WTA final today after defeating compatriot Daria Gavrilova 3-6, 6-4, 6-2 at the Sydney International.