Derby County's Chief Executive Tom Glick is to leave Pride Park.
The club has confirmed Glick has resigned from his position. He will now take up the role of chief commercial and operating officer at Manchester City. Glick joined Derby County in 2008.
In a statement, the club's board said it wished "to place on record their thanks to Tom for his hard work and dedication over the past four years."
Derby County says it will "take the appropriate time" to find the next chief executive but confirmed Glick will stay in his post over the summer.