Sam Clucas has completed his move to Hull City with Chesterfield banking an undisclosed club-record fee for the versatile player.
Clucas, who joined the Spireites from Mansfield Town just before the transfer window closed last September, made a total of 49 appearances and scored 12 goals during his time at the Proact.
After playing on the left wing and at left-back, the 24-year-old was moved up front following Eoin Doyle’s departure in early February.
Commenting on the transfer, manager Chesterfield manager Dean Saunders said: “Sam is a talented player and it has been a pleasure to work with him. Having made the rise from non-league to the Championship in a couple of years, he is a shining example to any youngster hoping to make the grade. He is a credit to himself and I would like to wish him all the best in his career.”
Clucas had spells at Lincoln City and Hereford United earlier in his career and also spent time with the Glenn Hoddle Academy in Spain.