Derbyshire have parted company with Kim Barnett on the eve of their Vitality Blast campaign.
Barnett was appointed as the club's cricket advisor following a winless County Championship campaign in 2016 - Derbyshire's first since the 1920s.
However, he has now stepped down, having appointed John Wright as specialist Twenty20 coach.
Wright's fellow New Zealander Grant Bradburn, the Scotland coach, will act as assistant coach for the Blast.
Last year under Wright, Derbyshire earned a home quarter final for the first time in the competition's history.
"Kim has provided invaluable support and guidance to the club and it is undoubted that we have a more competitive squad now in all formats of the game," said Derbyshire chairman Ian Morgan.
"The club would like to thank Kim for his contributions and wish him well for the future."
Derbyshire will now commence a process for the appointment of a head of cricket.
The midlands county have bolstered their attack in a bid to go one better in 2018, with the recruitment of Kiwi fast bowler Lochie Ferguson.
New Zealand's quickest bowler joins Pakistan left-armer Wahab Riaz as the second overseas player.
Derbyshire are 1212/1 to win the County Championship with Kent 8/13 and Middlesex at 1212/1.
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