Mitchell Marsh shoulders the weight of Australia's captaincy with ease as he readies the team for an unprecedented quest for three major global titles at the T20 World Cup in June.

Confirmed as captain during Wednesday's squad announcement, Marsh's journey marks a remarkable resurgence for the understated all-rounder since his return during last year's Ashes series.

At 32, he has already proven himself a popular and effective leader, steering the team to victories over New Zealand and T20 World Cup co-hosts the West Indies.

His relaxed demeanor resonates with the Australian squad, which has flourished since parting ways with fiery head coach, Justin Langer. Marsh, however, remains grounded despite the selectors' trust in his leadership.

"I've learned not to stray too far from who I am," Marsh shared with reporters. "While there's plenty of preparation ahead for the World Cup, once we're there, it's about maintaining a relaxed atmosphere."

Marsh's accolades include winning the prestigious Allan Border Medal in January, recognizing his pivotal performances in the Ashes, and Australia's triumph in the one-day World Cup in India last year.

Australia now eye history, aiming to become the first nation to simultaneously hold the global T20, one-day, and test championships, with another victory in the United States and the Caribbean.

Although he maintained a lighthearted tone during Wednesday's press conference, Marsh adopted a more serious stance when discussing the ambitious triple bid.

"It's not our primary focus as a team," he asserted. "While it would be extraordinary to achieve, our immediate goal is to navigate the challenges of the World Cup. The triple crown is more of an external motivation, but it's certainly a tantalizing prospect."