Travis Head will no longer be representing Yorkshire in this summer's NatWest T20 Blast competition due to international commitments.
Head has been called up by Australia A for their forthcoming tour of South Africa from mid-July to early August.
The left-handed batsman has been named in both squads, and he will captain Australia A in the one-day tri series with the A sides of South Africa and India.
Yorklshire are currently assessing their options in terms of an overseas replacement to join Peter Handscomb in the Yorkshire ranks.
This is the second blow for a county in 24 hours: Andrew Tye, another Australian, pulled out of Gloucestershire's NatWest Blast squad on Thursday because of a shoulder complaint.