George Dockrell has failed to make the grade for Ireland's squad for the one-day international against Australia because he will be taking school exams.
The teenage left-arm spinner has impressed since breaking onto the international scene, scoring top marks after taking 12 wickets in seven Twenty20 internationals.
But the 17-year-old, who made his ODI debut against the West Indies last month, becomes one of two players to be excluded from the squad that were knocked out of the group stage of the ICC World Twenty20 tournament.
"It's a pity that George can't make the game, but he has exams which are obviously important to his future," said Ireland coach Phil Simmons, who passed on the opportunity to include all-rounder Nigel Jones from his XIII.
"He'd been bowling really well and settled in superbly to international cricket. That has helped us offset the retirement of Kyle McCallan, and the injuries to Regan West."
Ireland were able to select wicketkeeper Niall O'Brien, who has a fractured left index finger, after the 28-year-old took a cortisone injection to ensure he can take his place.
Simmons' side will play Australia in a one-day international for just the second time when they meet at Clontarf in Dublin on June 17 and captain William Porterfield is looking forward to the challenge.
"It's the one game that all the players have been talking about since the fixture was announced last year," he said.
"You can't help but be motivated by the chance to play the world champions, especially in front of the home supporters.
"It'll be a great experience playing against players of the calibre of Ricky Ponting, Michael Clarke, Mike Hussey and Mitchell Johnson. We'll certainly not be overawed though."