Saracens have sacked director of rugby Steve Diamond, with former Australia coach Eddie Jones joining the club in a consultancy role.
Diamond has failed to take Saracens up the Premiership table
Head coach Mike Ford and the rest of the coaching staff will stay in their current roles while the club searches for a new director of rugby.
Jones, who will work on a part-time basis, will join up with the club next week until the end of the season.
Saracens are currently 10th out of 12 in the Guinness Premiership.
The former Sale hooker took over at Saracens at the end of 2004, after originally joining as rugby manager.
Saracens qualified for this season's Heineken Cup but were edged out of a tough group in the group stages.
But the team's recent form - two wins from their last 10 games in all competitions and five straight Premiership defeats - ultimately proved Diamond's undoing.
"We'd like to thank Steve for his efforts, but based on recent results and a difference of opinion over the future direction of the club, we've asked Steve to step down," said Saracens chief executive Mark Sinderberry.
"The club will be looking for a new director of rugby, and in the meantime Eddie Jones will be joining us on a consultancy basis.
"We have been talking to Eddie for a number of weeks about him joining us for a short period allowing us to utilise his knowledge."
Saracens have been through several coaching regimes in recent years with Rod Kafer, Wayne Shelford and Francois Pienaar all leaving the club.
Jones, who was sacked by Australia last year after they lost eight out of nine Tests, will leave at the end of the season to take up his role with the Queensland Reds.
The 46-year-old coached Australia for four years, taking the Wallabies to the 2003 World Cup final.
Saracens' next game is a crucial relegation battle against fellow Premiership strugglers Bath on Sunday.