Nottinghamshire will prevent some of their players from competing in the Indian Premier League next year.
England internationals Alex Hales, Michael Lumb and Samit Patel are all targets for IPL franchises for the forthcoming season, which begins on April 3.
That is just a week before the County Championship begins and director of cricket Mike Newell says he will not allow them to miss the first part of the season.
"We were very clear that we expected all of our players to be available to us as we would be severely weakened if we were to lose them for that period of time at that stage of the season," Newell said.
"The players asked me to consider releasing them to enable them to take part in the IPL.
"But they are key members of the squad and I explained that we wouldn't be able to allow them to take part."
Nottinghamshire's other England players, Stuart Broad and Graeme Swann, will be allowed to play because their central contacts are governed by the ECB