English county side Nottinghamshire had to leave out South African wicketkeeper-batsman Quinton De Kock after a special request made by CSA. The county side had earlier roped in De Kock but his international commitments for South Africa is what has made the board retain him.
De Kock is currently captaining South Africa in the final two One-Day International matches of the away series against Sri Lanka in the absence of Faf du Plessis.
"We're disappointed because Quinton is a high-quality player and we would have been stronger with him in the side, but he has a central contract with Cricket South Africa and there is always some risk when you sign a player of his profile," Nottinghamshire Director of Cricket Mick Newell said.
"We would like to strengthen the team for the remaining red ball fixtures and will consider the options that are out there but it's a particularly tough market at this stage of the season. If there's something that can be done then we'll explore it but there isn't a long list of available overseas talent."
South Africa are leading the five-match ODI series 3-1 after Sri Lanka won the rain-interrupted fourth ODI on Wednesday. Leading his side, De Kock scored 23 and took two catches in a losing cause for the Proteans.
(Inputs from Cricbuzz)