The Spireites made their final signing on transfer deadline day when they captured defender George Smith from Northampton Town.
He joins Chesterfield on a deal until the summer of 2019 after the two clubs agreed an undisclosed fee.
Smith is a 21-year-old left-back who started his career at Barnsley.
He made 36 full appearances for the Tykes before joining Gateshead on a free transfer.
Smith signed for Northampton last summer and has made ten appearances this term.