Last week Williams' coach, Patrick Mouratoglou, told CNN Sport that a decision would be made during an upcoming training session in Florida on whether or not the 23-time grand slam champion would make her comeback and compete in Melbourne, where play starts on January 15.
She has not played competitively since Melbourne, raising questions over whether the 23-time Slam victor would attempt to defend her title next month and equal Australian Margaret Court's singles record of 24 major titles.
Tiley declared that Williams's return to tennis in Melbourne was "very likely".
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Williams earlier this year told Vogue magazine that she has outlined "the most outrageous plan" for her return.
"She wants to break the record owned by Margaret Court and it would be a significant accomplishment for her to be able to do that". It ruins lives. I think one of the hardest days of all of our lives was having to tell our sister's children what happened to their mom.
Back in action! Serena Williams returned to the tennis court over the weekend, marking her first public sporting appearance since she married Alexis Ohanian and gave birth to their daughter, Alexis. Her daughter, Alexis, was born September 1.