Chesterfield have handed professional contracts to forward Jamie Jackson and defender Jamie Lowry. The pair have come up through the youth ranks at Saltergate, although they have not yet appeared for the first team.
Spireites manager Roy McFarland told the League One club's website: "They have done very well in their three years at the club.
"They are getting bigger, stronger and better, and we hope they can develop and have long-term futures here."