The 19-year-old has re-united with his former Forest Green Rovers boss Jimmy Ball by agreeing to a permanent deal with the Stags.

Originally a forward, Hallett, who is a former member of Southampton’s academy, was converted into a defender by Ball when the Stags manager was in charge at The New Lawn outfit last year.

Hallett grew up in nearby Netley and played youth football with Sholing, in addition to his spell with the Saints.

He then joined Forest Green’s academy and made his first-team debut for the Green Army in League Two as a substitute against Stevenage in early-March 2021, before signing professional terms with the club that summer.

He spent last season on loan with Southern Premier Division South side Gosport Borough, making 37 appearances and scoring 6 goals in all competitions.

Ball told his club’s website: “We added some experience to the squad with the signing of Mike Carter last week and now we’ve brought in a young, talented player who I know very well. He can make a massive contribution for us this season and I hope that we’ll be able to help him progress his career and find his way back into professional football”.