"I'm pretty confident - obviously I'd like to fill that role," he said.
"It's going to be good fun and hopefully if I get the opportunity, I can take it."
Marsh wants to prove he can cope with the pressure at the end of the innings.
"It's just bowling more and getting that experience," he said.
"I'd like to keep working on my 'death' bowling and being an option at the death.
"That's really important, to have as many options as we can."
Captain Michael Clarke is set to return to the Australian team for tomorrow's warm-up match against the UAE after recovering from his own well-documented hamstring and back injuries.
"I did offer him my hamstrings, but he politely rejected them," Marsh said.
"I think he's going to be fine. He's such a key player for us, he's captain, so we'll be rapt to get him back."
Another bonus for Australia ahead of the World Cup has been Glenn "The Big Show" Maxwell's booming return to form.
Maxwell belted 122 from 57 balls on Sunday as Australia mauled India by 108 runs at Adelaide Oval.
"I've been lucky enough to be out in the middle with Maxy in the last few innings, just to watch it," Marsh said.
"It's great to see him in form and great to see him batting with the maturity he has [shown] in the last few innings."
- AAP