Credit: Mansfield Town/Twitter
The 25-year-old most recently spent two seasons with Portsmouth, making 50 appearances in total for Pompey, with most of those outings coming in League One.
Donohue began his career with Bodedern Athletic in Wales, before moving to Everton as a youngster, spending six years in the Toffees’ academy.
Following his time with Everton, the midfielder spent time with Welsh outfits Porthmadog, Holyhead Hotspur and Caernarfon Town, before moving back to England with Sutton Coldfield Town.
In 2015, Donohue impressed on trial with then-League One side Chesterfield, where he was able to earn a professional contract.
He would become an important member of the Chesterfield squad, making 62 appearances in two seasons for the Spireites.
In August 2017, Donohue would move to Portsmouth for an undisclosed fee, helping Pompey to respective eighth and fourth-place finishes in Sky Bet League One.
Manager John Dempster said:
“Dion is somebody who can play in midfield – he’s a very good footballer with a good left foot – but he also provides us with competition and cover at left-back.
“When he got his move to Portsmouth from Chesterfield, he was playing as a left-back, which shows the quality he has.
“He is someone that can pass the ball well and he has great set play delivery. He’s someone that brings something slightly different to the squad that we’ve already got.”
Donohue is Dempster’s fourth signing this summer as the midfielder joins the signings of Andy Cook, Aidan Stone and Nicky Maynard as the Stags look to make it a third time lucky and get promoted into Sky Bet League One.
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