Derby have confirmed Steve McClaren as their new head coach on a three-year contract.
The former England boss was the Rams' first choice to succeed Nigel Clough.
Clough was sacked on Saturday evening just hours after Derby's 1-0 defeat to east midlands rivals Nottingham Forest at the City Ground, ending his four-and-a-half-year reign.
McClaren arrives from Sky Bet Championship rivals QPR, where he has been a coach under Harry Redknapp since the beginning of July.
No compensation was necessary as the short-term deal he signed in the summer was set to expire this week.
The 52-year-old's appointment sees him return for a third spell at the club he served first as a player and then assistant to Jim Smith, whom he helped to guide Derby to the Premier League in the 1995/96 season.
He will have former Carlisle and Preston boss Paul Simpson as first-team coach and Eric Steele, formerly of Manchester United, as goalkeeping coach.