Exciting young winger Gboly Ariyibi has signed a new two-and-a-half-year contract.
The former Southampton player has impressed in recent weeks after being given his chance in the first team.
Commenting on the news, manager Paul Cook said: "Gboly is a very, very exciting young prospect who has great ability and pace. He is still developing as a player so there has to be some patience shown by fans as he learns the game."
Ariyibi, 20, joined Chesterfield in the summer after a spell at Leeds United. He made his debut in the JPT tie at Scunthorpe in September and has now made a total of eight appearances.
Born in Virginia, USA, before being brought up in England, Ariyibi is a USA Under-20 international.