Chesterfield have completed the sale of defender Liam Cooper to Leeds United.Cooper travelled to Leeds for a medical and hold talks with the Championship outfit after the two clubs agreed an undisclosed fee.
Spireites boss Paul Cook said: "It has been a pleasure to work with Liam, who was a key member of our title-winning squad last season. I would like to thank him for his valuable contribution and wish him all the best for the future."
The 22-year-old centre-back joined Chesterfield on loan from Hull City in November 2012 before signing on a permanent basis in January 2013.
He made a total of 80 appearances for the Spireites and scored six goals.