Worcestershire are searching for a new overseas player after Fidel Edwards was ruled out through injury.
The West Indies paceman had been due to arrive at New Road to replace Australian Steve Magoffin for the second half of the season.
However, Edwards was troubled by a knee injury throughout the Test series against Australia and has been advised to rest.
The Pears are now in the process of looking for a replacement and are hoping to make an announcement in the near future.
"Unfortunately the news about Fidel has come as a bit of surprise as we have been in touch with him regularly and all seemed to be going well," director of cricket Steve Rhodes said on the county's website.
"We have immediately started the search for an alternative overseas player and I hope we will have some news soon."
There was better news for Worcestershire fans with the county confirming that young batsman Alexei Kervezee has signed a new two-year contract.
The 17-year-old Dutchman has made just one first-team appearance so far but is viewed as one for the future.
Rhodes added: "We are delighted that Alexei will remain with the Club. He has come on really well this season and is putting pressure on those above him for a 1st XI place."