Eoin Doyle's transfer to Championship side Cardiff City has been completed for an undisclosed seven-figure fee.
After the fee was agreed earlier in the day the striker travelled to Cardiff to discuss personal terms and undertake a medical - and the transfer has now been completed.
Doyle signed for the Spireites from Scottish side Hibernian in the summer of 2013 on a free transfer and scored 32 goals in his 69 appearances for the club.
The 26 year-old was part of the side that was crowned League 2 champions in May 2014 and leaves the Proact Stadium having scored 25 goals in all competitions for the Spireites this season.
Speaking earlier in the day Spireites chief executive Chris Turner had said: "We have reached an agreement with Cardiff after negotiating a deal we feel is good business for the club.
"Some of the money we receive will be used to reduce the club's debt but funds are also being made available to manager Paul Cook to strengthen the squad and one or two signings are in the pipeline."