Jos Buttler will leave Somerset County Cricket Club at the end of this season.
The Club said it was very disappointed to make the announcement.
Chief Executive Guy Lavender said: “Both Jos and the Club have worked extremely hard over the last few months to find a solution, which satisfies Jos's understandable desire to have more time behind the stumps in order to advance his international career.
Guy Lavender went on to say: "I would like to make it clear that he has behaved impeccably during this difficult process."
Cricket and Somerset's run of good form in this year's T20 cup has come to an end.
They were soundly beaten by Glamorgan in Cardiff by nine wickets with 28 balls to spare. Pete Trego top scored on 40. One bright note - Marcus Trescothick made 7, ending his spell of four ducks in a row.
Somerset 125/6 (20/20 overs)
Glamorgan 126/1 (15.2/20 overs)
Glamorgan won by 9 wickets (with 28 balls remaining)
More than a thousand children were at the County Ground in Taunton for Somerset cricket's first ever schools day.
The youngsters paraded in the field at lunchtime during a break in play in the championship match between Somerset and Sussex. The children watched the game for free, took part in games and met some of the players.
This is the moment Somerset captain Marcus Trescothick was caught out for a duck at the County Ground this afternoon. It's his fourth duck in the space of five days. He was batting in Somerset's second innings against Sussex.