Australian T20I team captain Mitchell Marsh confirms he's not ready yet to play for Australia but he'll be fit in the T20 World Cup.

Marsh has not played since his last appearance for Delhi Capitals in the IPL on April 3 due to a right hamstring strain. He was flown home from the IPL to Perth on April 12 to do his initial recovery with Australia team.

Speaking in Perth on Thursday after being confirmed as Australia's captain for the World Cup, Marsh said he was still working back to full fitness but was confident he would be right for the World Cup.

"The hammy is good, it's coming along really well," Marsh said. "It's pretty much exactly where we want it to be. It's one of those things. Just got to get it right over the next three weeks and get on the plane.

"If we had to play tomorrow, I would be in a bit of trouble. Still a couple of weeks away, and the timing probably sits perfectly barring any setbacks."

Marsh also talked about the fitness issues of David Warner and said he's always excited to have Warner in his side.

"It's been a long last hurrah, hasn't it for Davey?" Marsh said. "We're always really excited to have him in the team. Just the experience that he brings. I think if we look back at his career. There's been so many big moments that you need your big experienced players to stand up and Davey has always been one of those. So we're lucky to have him."