Chelsea have appointed Guus Hiddink as their new manager until the end of the season, after the departure of Jose Mourinho.
The defending Premier League champions parted company with Jose Mourinho with the club 16th in the table and just one point clear of the relegation zone.
Chelsea have won just four of their 16 league fixtures so far this season and a 2-1 loss at leaders Leicester City proved the final straw.
The 69 year-old Dutchman was present for the 3-1 win over Sunderland with Steve Holland and Eddie Newton in charge of first-team affairs.
"I am excited to return to Stamford Bridge. Chelsea is one of the biggest clubs in the world but is not where it should be at the moment. However, I am sure we can all turn this season around," Hiddink said in a statement.
"I am looking forward to working with the players and staff at this great club and especially renewing my wonderful relationship with the Chelsea fans."
Hiddink was previously appointed on an interim basis after the sacking of Luiz Felipe Scolari in 2008-2009 and guided the club to FA Cup glory.
Hiddink's managerial career
PSV Eindhoven (1987-1990)
In first managerial role, Hiddink led PSV to three Eredivisie crowns and as many KNVB Cups, as well as the European Cup in 1988.
Spent one year at the helm, finishing fifth in the Turkish top flight and exiting the UEFA Cup at the first hurdle.
Got the side playing attractive, attacking football, leading them to European qualification in his first two seasons.
Took the reins of the Dutch national team for the first time, leading a divisive group to the Euro 96 quarter-finals and World Cup semi-finals two years later.
Real Madrid (1998-1999)
A short, frustrating spell at the Bernabeu came to an end shortly after controversially suggesting the club needed to be "much more professional". Hiddink did, though, manage to win the Intercontinental Cup in his time there.
Real Betis (2000)
Hiddink's last spell in Spanish football was very short, with struggling Betis sacking him after a matter of months. They were relegated at the end of the season.
Korea Republic (2001-2002)
Led the World Cup joint hosts to a remarkable semi-final finish, earning awards and plaudits aplenty.
PSV Eindhoven (2002-2006)
Hiddink's return to his first club brought with it three more Eredivisie titles, a KNVB Cup and Dutch Super Cup. Furthermore, PSV reached the Champions League semi-finals in 2005.
Combining the national team post with his work at PSV, he led the Socceroos to their first World Cup finals appearance in 32 years. They reached the second round and exited somewhat controversially to eventual winners Italy.
Hiddink impressively led the Russian national team to the Euro 2008 semi-finals, but failed to qualify for the 2010 World Cup after losing to Slovenia in the play-offs.
Took interim charge at Stamford Bridge after Felipe Scolari's departure. Combining with the Russia job, the Blues went out of the Champions League to eventual winners Barcelona and lost just one Premier League match, with his first spell ending by winning the FA Cup.
A seemingly exciting appointment went awry and Hiddink resigned after failing to lead Turkey to Euro 2012 qualification.
Anzhi Makhachkala (2012-2013)
Returning to club management for the first time in six years, the Dutchman led Anzhi to third in the Russian Premier League and Europa League last-16. He resigned two matches into the following campaign.
Replacing Louis van Gaal after the 2014 World Cup looked a great move but proved a disaster. The Dutch lost five of his 10 matches during his 10-month spell.