Michael Klinger will join Worcestershire for the first few weeks of the county cricket season.
The South Australia captain will stand in for compatriot Phil Hughes who has been delayed until late May through international commitments.
Klinger, 31, has an average of over 50 in 72 first-class innings for the state. He recently scored the third double century of his career against Tasmania.
Worcestershire director of cricket Steve Rhodes said: "I saw Mike play out in Adelaide against New South Wales in October. His skill, attitude and maturity as a player made me sit up and take note.
"He has recently captained South Australia to the domestic one-day title and his batting was one of the main reasons for the success."