Brown's time at Nottinghamshire was hampered by injury
Nottinghamshire have released off-spinner Jason Brown with a year still remaining on his two-year contract.
Brown, 35, moved to Trent Bridge a year ago after 12 years at Northants, having toured Sri Lanka with England in 2001.
His time at Notts has hampered by a calf injury and he has not played first-class cricket since June.
He said: "I'm over my injury and want to be in a position where I can begin next season in contention for a place in a county first team."
Brown has taken 414 first class wickets with his two counties, at an average of 33.91. After touring the West Indies with England A in 2000, he was called up to the senior team but only played in one warm-up game in Sri Lanka.
He added: "I've enjoyed my time at Trent Bridge but at this stage of my career I need to play regular cricket."
Nottinghamshire director of cricket Mick Newell said: "Jason was unfortunate to suffer injury at a time when he could have played a significant part in limited-overs cricket but we feel that the time is right for him to move on, given the signing of Graeme White.
"It has been a frustrating year for him but there was no lack of effort on his part and I'm sure he'll find another county. We wish him every success for the future."
Slow left-armer White, 22, recently followed Brown in moving from Northants to Trent Bridge earlier this month.