Kent have reluctantly agreed to allow Andrew Hall and Justin Kemp to return to South Africa. The two all-rounders have been told to report for squad training sessions and will miss the rest of the county season as Kent battle for the title.
They are 19.5 points behind leaders Notts but could wipe out most of that deficit if they beat them this week.
"The club is bitterly disappointed to lose Hall and Kemp's services," said chief executive Paul Millman.
The same situation applies to Warwickshire, who will lose fast bowler Makhaya Ntini for their final game against Sussex.