“Obviously not having guys like Pat Cummins and Josh Hazlewood is a big blow for us,” player of the match Ellis told reporters.
“I don’t like to be called the leader of the attack.
“I am just happy being out here playing a World Cup and representing Australia. Glad we started off the competition well and looking forward to a good tournament.”
Ellis ripped through Ireland’s top order with two wickets in his first over and they were soon 27-4.
A 46-run sixth wicket stand between Lorcan Tucker and George Dockrell offered some resistance but they were never in the hunt in the face of some disciplined bowling.
Dockerell scored 41 off 29 balls before being stumped off Zampa.
Marsh was ruled out before the match after being struck in the groin during training on Tuesday.
Australia were quick to call up Steve Smith, who will fly to Sri Lanka on standby in case opener Marsh is unable to take any part in the tournament.
“Mitchell Marsh will miss the opening match of the ICC men’s T20 World Cup after sustaining a direct blow to the groin during training earlier this week,” said Cricket Australia in a statement.
“He is experiencing ongoing pain and discomfort which is restricting his movement.
“Scans have confirmed internal testicular bleeding and he will require a period of rest and rehabilitation.
“His return to play will be guided by symptom resolution and medical advice.”
It is the latest injury blow to hit the Australia squad after leading pace bowlers Cummins and Hazlewood were forced out after failing to recover from injury in time for the month-long tournament.
The in-form Smith, Australia’s best player against spin, was controversially omitted from the original squad despite his blistering Big Bash League form this year as an opening batsman.