Nathan Buck has become the fourth player to leave Lancashire since the end of the season as Ashley Giles, their director of cricket, rebuilds the county's playing staff.
Buck, who was released from his contract a year early, has joined Northamptonshire, the defending NatWest Blast champions, on a three-year deal.
Buck's two years at Lancashire have been largely unproductive. He joined them at the end of the 2014 season from Leicestershire, but suffered an injury-hit first season for the Club, featuring in just two games before spending last winter in Sydney playing grade cricket for Manly.
He went on to play a further 17 games for Lancashire this season in all competitions, taking 12 wickets in this year's NatWest T20 Blast including T20 career best figures of 4 for 26 at Edgbaston against the Birmingham Bears.
Buck "It will be a new challenge for me and I'm looking forward to getting back to my best with some exciting cricket.
"Northants are a strong, tight-knit side that have done exceptionally well this season. I can't wait to be a part of it."