Williams, who won her 23rd grand slam title when pregnant at the 2017 tournament in January, gave birth to daughter Alexis Olympia Ohanian Jr. on Sept. 1. She has just three months to get fit if she is to defend her title.
"Serena will be back," Tiley told reporters in Melbourne.
"She wants to come back in 2018 and defend her title and she's in training now.
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"There's several months to go and obviously it will be up to her as to where she is with her fitness."
The 36-year-old would be competing for a tournament record A$4 million (£2.36 million) winner's purse in 2018, with total prize money hiked 10 percent to A$55 million.
(Reporting by Ian Ransom; Editing by Peter Rutherford)
