'I couldn't care less': Tim Tszyu's cold message for Michael Zerafa amid Melbourne lockdown

A ruthless Tim Tszyu says he "couldn't care less" about how Michael Zerafa is feeling amid Melbourne's COVID-19 lockdown, as the rising Australian boxing sensation prepares to clash with him on July 7.

Zerafa and the rest of Greater Melbourne were hit with a crushing blow when the Victorian government announced this week that the lockdown had been extended by seven days.

But as Tszyu fine-tunes for his bout with Zerafa at Newcastle Entertainment Centre, the 26-year-old says he's only focusing on his own preparation.

"He'd be struggling out there ... in lockdown," Tszyu told reporters with a wry grin.

"I completely block it out. I couldn't care less about what he's feeling. It's not up to me, I can't change things, I just keep on doing what I always do."

Adding to Zerafa's disrupted preparation was a kidney infection that left him feeling "a little green" and curled up "in a ball", although he's now out of hospital.

Tszyu is gearing up for the super-welterweight clash on the Gold Coast and he raved about the set-up.

"First of all, the weather here is beautiful. Feels like it's summer," Tszyu said.

"We've got a nice place by the beach where you can do your morning runs ... there's plenty of sparring around here and the fact that you're away from home and all you have to do is focus on one thing and that's boxing ... There's no birthdays, there's no christenings, there's no weddings; there's boxing and that's it."

Tszyu, the son of former light-welterweight world champion Kostya, was born in NSW - and he scoffed when a reporter suggested he should ditch the Blues for the Maroons.

"I'm born and bred in NSW and will always be a NSW boy," Tszyu laughed.

"But who knows? I love the Gold Coast; hopefully one day I can move here. Who knows where life can take ya?"