Fomer Northern Ireland internationals Jim Magilton, Damien Johnson and Kevin Horlock are included in a new management team for the under-21 side.
Mark Crossley, a former goalkeeper with Wales, will also assist the squad.
Magilton, who took on the role of manager at the end of the last campaign, will continue in this position, with Horlock and Johnson as assistant coaches and Crossley as goalkeeping coach.
Magilton is currently the Irish FA's Elite Performance Director.
Northern Ireland boss Michael O'Neill said: "I am delighted to have Jim Magilton in charge of the very important under-21 squad and I feel that given Damien, Kevin and Mark's experience, they will be perfect role models for these young players to assist them in their football careers."
Magilton said: "I was in charge of the under-21s at the end of the last campaign and am excited by the prospect of working with this group over the next two years and I hope that with this backroom team on board together we can play a role in helping some of these players make the step up to the senior international side."
Johnson, a coach at Blackburn Rovers Academy, said: "I am honoured to have this opportunity to play a part in developing young players for the senior international team."
Crossley joined the Northern Ireland under 21 set-up in 2014.
The under 21-squad will kick-off their 2017 Uefa European Under-21 Championship qualifying campaign with a home game against Scotland on September 5 and an away clash against Iceland on September 8.