Mark Duffy joins Chesterfield

The loan will run up to and including 1 March 2015 and there is no recall permitted as it is within the first month.

The 29-year-old winger, who joined Blues last summer after leaving Doncaster Rovers, has found his playing time limited this season.

The Liverpudlian has made just three starts and four substitute appearances for Blues.

His last taste of match action came during Blues' FA Cup third round win against Blyth Spartans at the start of last month.

Chesterfield, who are managed by Paul Cook, are currently pushing hard for promotion and in the fifth-placed play-off spot.

They are next in action this coming weekend when they travel to Notts County on Saturday.