A city-based Twenty20 tournament could have "far-reaching consequences" for counties who play at non-Test match grounds, says Kent chief Jamie Clifford.
Hosts Kent beat Derbyshire with a day to spare to earn their third win from three Division Two games so far this season.
Darren Stevens took his third five-wicket haul of the season for Kent before Derbyshire's bowlers hit back.
Derbyshire's bowlers chip away with regular wickets to prevent Kent from getting a foothold at Canterbury on day one.
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How to get into cricket - physical exertion with a chess-like element in matches which range from half an hour to five days.