Experienced midfielder Joel Byrom joined the Stags after leaving former club Northampton Town prior to the opening of the January transfer window.
Byrom joined the club on a free transfer from Sixfields.
The 30-year-old came through the youth ranks at Blackburn Rovers before leaving to join Accrington Stanley at the age of 20.
After making just a handful of appearances for Stanley, Byrom had spells with non-league clubs Clitheroe, Southport and Northwich Victoria before securing a move to Stevenage.
Whilst with the Boro, he played a pivotal role in their promotion to the English Football League and their subsequent promotion to League One the following season.
Despite making 40 appearances in their League One campaign, Byrom rejected a new deal at the Lamex Stadium and re-joined former boss Graham Westley at Preston North End.
After a loan spell with Oldham Athletic, the Lancashire-born midfielder joined Northampton Town where he won promotion from League Two last season after making 40 appearances during the campaign.