Chesterfield have brought in Wolves' Mark Little on a month's loan.
The 21-year-old defender has been signed on an emergency basis and will go straight into John Sheridan's squad for their Johnstone's Paint Trophy game against Huddersfield at Saltergate on Tuesday.
Little has made his first-team debut for Wolves and has been capped by England at U17, U18 and U19 levels. He has had two loan spells with Northampton in the last two seasons.
Sheridan said: "Mark brings more pace into the side and healthy competition, which brings the best out of the squad."