Lancashire have released seam bowlers Saj Mahmood and Naqaash Tahir following their relegation from Division One of the County Championship.
Ant Botha and Naqaash Tahir will both leave Warwickshire at the end of the season.
Warwickshire duo Jim Troughton and Naqaash Tahir are in line for their first Championship appearances of the season.
Tri-Series in Australia 2015
England need 218 runs to win from 35.1 overs
Australia and New Zealand will co-host the 2015 Cricket World Cup from February - here's a taster of what's in store.
England can take great heart from reaching Sunday's Tri-Series final with a tough win over India, says David Lloyd.
David Lloyd raises a glass to the 'Tubby' Taylor wine tour, the BBL and England's showdown with India.
England's World Cup opponents will not relish the return of fit-again James Anderson, says Nick Knight.
Bob Willis says AB de Villiers could well be the best batsman of all time after blasting a record ODI ton off 31 balls.
As England fly off to Australia, Nasser Hussain explains why 2015 is a year to savour...
Sky Sports' cricket experts have picked their favourite hundreds from previous World Cups. Do you agree with their choices?