Tom Taylor and Rob Hemmings have left Derbyshire by mutual consent.
The pair, who are both in the final year of their contracts, have been released from their current deals and leave the Club with immediate effect.
As the final round of the Natwest T20 Blast 2017 kicked-off on Friday, the eight teams for the quarter-finals of this edition has been finalised with Leicestershire and Somerset just managing to make it to the top eight.
After Derbyshire restricted Leicestershire to 104 for nine in the 20 overs, Wayne Madsen led the chase with an unbeaten 49 run knock as the home side completed a seven wicket victory in the Natwest T20 Blast North Group encounter in Derby.
Grant Elliott and Keith Barker shared seven wickets between them as Warwickshire defended a total of 197 runs against Derbyshire to win the North Group Natwest T20 Blast encounter at Edgbaston by 20 runs.
A blistering 85 run unbeaten knock and a two wicket haul from Wayne Madsen went in vain as Nottinghamshire registered a six run victory while defending 228 runs against Derbyshire in the North Group clash of the Natwest T20 Blast at Trent Bridge.
Jos Buttler played a calm innings under pressure after Matt Parkinson sparked on his debut with a three-wicket haul as Lancashire registered a five wicket win against Derbyshire in the Natwest T20 Blast North Group encounter in Manchester.