Stags signed midfielder Oscar Gobern halfway through September 2016 after he was released by QPR at the end of the 2015/16 season.
The 25-year-old was promoted into the Championship with Southampton in 2011 and Huddersfield a year later.
After making over 70 appearances for Huddersfield, the 6ft 3in midfielder was snapped up by QPR, before a knee injury halted his development at Loftus Road.
He made his debut for Adam Murray's side just a day after signing, replacing CJ Hamilton at half-time of the 0-0 draw against Hartlepool United.
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