Former West Indies seamer Corey Collymore will be released by Middlesex at the end of the season.
Collymore, 35, who took 93 wickets in 30 Tests for the Windies, has represented the Lord’s county for the last three seasons.
He claimed 96 scalps in that period, helping Middlesex to promotion from Division Two of the LV= County Championship in 2011.
Managing director of cricket Angus Fraser said: “It is not a coincidence that Corey's three years at Middlesex came during a period when the club has made considerable progress.
“He is a wonderful pro and an exceptional man. He is proud, honest, hard-working and has set a wonderful example to our young and seasoned cricketers. I have thoroughly enjoyed working with him.
“At Middlesex we are fortunate enough to have a number of talented young fast bowlers who need to be pushing for first-class cricket. The challenge for them is to seamlessly fill the hole created by Corey's departure.
“Like Middlesex's previous Barbadian cricketers - Wayne Daniel, Desmond Haynes, Roland Butcher and Pedro Collins - Corey will always be welcome at Lord's."
One of the emerging seamers Fraser refers to is Harry Podmore, who has signed a two year contract with Middlesex.
The 19-year-old spent 2011 and 2012 with the Middlesex Academy and joined MCC Young Cricketers this year, having been a regular member of Middlesex's second XI last summer.
Fraser added: "Harry has worked hard to get a contract with Middlesex CCC and he thoroughly deserves the opportunity he has been given. His bowling continues to develop and with further hard work he will become a fine bowler.”