World No.77 Kokkinakis confirmed his absence from the Brisbane tournament, which starts on Sunday, on social media.
"Sad to miss the Brisbane International this year," Kokkinakis wrote.
"Dealing with a small hip issue that needs some more time, but hopefully back for the rest of the summer."
Sad to miss — Thanasi Kokkinakis (@TKokkinakis) @BrisbaneTennis this year. Dealing with a small hip issue that needs some more time, but hopefully back for the rest of the summer ✌�December 26, 2024
If Kokkinakis recovers, his first tournament of his Australian summer campaign would be the Adelaide International which begins on January 6.
The 28-year-old South Australian won his home tournament in 2022, his first ATP title win.
The Australian Open begins in Melbourne on January 12. Tomljanovic is hopeful of recovering from a left knee injury in time for the first grand slam of the year but the world No.109 will miss both the Brisbane International and Hobart International in the lead-up.
"I'm so disappointed to withdraw from the Brisbane International but I wanted to be 100 per cent ready to compete, which I am not," Tomljanovic said on Instagram.
"I'll continue my prep and see you all at the Australian Open."
Ajla Tomljanovic grimaces during a 2024 Australian Open match in Melbourne. (James Ross/AAP PHOTOS)
Tomljanovic missed this year's Australian Open, French Open and Wimbledon due to her knee injury.
The 31-year-old's last appearance on the WTA Tour was at the Merida Open in Mexico in October.
Kokkinakis's last event played was at the UTS Grand Final in London in early December.
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