John Peacock has left his role as Derby County first-team coach following Paul Clement's sacking as head coach.
Former England Under-17 boss Peacock worked as Derby's academy director for four years from 1998 and joined Clement's new-look coaching set-up in June last year.
Peacock, 59, spent a total of 21 years working at the Football Association either side of that spell.
Head of tactical analysis David Burke has also left the Championship side.
But BBC sport understands assistant coach Kevin Phillips, 42, and goalkeeping coach Pascal Zuberbuhler, 44, are both staying at the club.
The Rams are fifth in the table, five points off leaders Hull City following a seven-match winless run in the league.