Experienced central defender David Mirfin joined the Stags in May 2017 after leaving former club Scunthorpe United.
Sheffield-born Mirfin graduated from the Huddersfield Town academy in the 2003/04 season and helped to keep 16 clean sheets in 25 matches as the Terriers won promotion from Division Three.
The 6ft 1in defender was a rock in Huddersfield's defence over the next few League One seasons, winning the Players' Player of the Year, Away Supporters' Player of the Year and Fans' Player of the Year for the 2006/07 season.
He left West Yorkshire at the beginning of the 2008/09 season and joined Scunthorpe United for a deal worth a minimum of £150,000.
His first season at Glanford Park culminated in promotion to the Championship via the play-offs, with Mirfin making 37 league appearances.
Mirfin played a major role in the Iron maintaining their Championship status following promotion, but then opted to leave Glanford Park at the end of the following season to join Watford on a two-year deal.
However, Mirfin returned to former club Scunthorpe United on loan until the end of the 2011/12 season, before signing permanently for the Iron.
The former Huddersfield man missed just one game in a season which saw Scunthorpe secure promotion to League One in 2014.
A brief loan spell with Hartlepool United followed in the 2014/15 campaign, before he returned to Scunthorpe and once again became an integral part of their side.
Mirfin made 36 League One appearances last season as the Iron finished in the play-off positions, bowing out after a 3-2 aggregate defeat against eventual winners Millwall.