Travis Head will be unavailable for Yorkshire's NatWest T20 Blast campaign this summer after being selected for Australia A's tour of South Africa.
Yorkshire confirmed the 23-year-old batsman's absence in a press statement on Friday morning.
It said: " Travis Head will no longer be representing Yorkshire in this summer's NatWest T20 Blast competition due to international commitments."
Head will captain Australia A in the one-day international tri-series and has been named too in the squad for the longer format on a tour which runs from mid-July to early August.
Yorkshire must therefore decide whether to seek an alternative overseas signing to join Head's fellow Australian Peter Handscomb at Headingley.