New Zealand's opening batsman Jeet Raval will replace his national captain Kane Williamson as Yorkshire's overseas player for the final four matches of this season.
Williamson has been nursing a bruised finger on his left hand ahead of the match against Worcestershire starting at Scarborough on Sunday.
Raval, 29, has made 11 Test appearances, scoring a total of 648 runs at an average of 38.11.
Yorkshire's director of cricket Martyn Moxon said: "We are delighted that Jeet has agreed to join us, initially as cover for Kane Williamson. Jeet will take over from Kane after the Somerset match and be with the squad until the end of the season.
"Kane has spoken highly of Jeet. We look forward to him joining and hopefully having a successful period with us."
Yorkshire's long-term opening partnership of Adam Lyth and Alex Lees was split when the latter lost form ahead of a recent move to Durham.
Raval, who is likely to be pitted alongside Lyth, added: "I'm absolutely thrilled to get this opportunity. It has worked out really well and I would love to get out there and make a contribution to the team.
"I'm a fairly orthodox player. I steady myself to bat for long periods of time. My role as an opening batsman in the team is to deny the opposition for long periods and set up a good total for the team that we can bowl at.
"More importantly, I'm looking forward to this opportunity and hopefully I will be able to contribute in a positive way."
Yorkshire are 66/1 to beat Nottinghamshire in the T20 Blast on Friday and 1212/1 to win the County Championship Division 1 title this year.
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