Lampard is the 12th different manager to serve under owner Roman Abramovich.
Here the PA news agency looks at each of their records at the club – with the figures making unpleasant reading for the incumbent.
Claudio Ranieri – Sep 2000-May 2004
Won 107, drew 46, lost 46
Win percentage 53.8, points per game 1.84
The Italian was at the helm when Abramovich arrived at Stamford Bridge in June 2003. After heavy spending he led Chelsea to a second-place finish in the Premier League and the Champions League semi-finals but was sacked at the end of the season. He went on to win a memorable Premier League title with Leicester in 2016.
Jose Mourinho –Jun 2004-Sep 2007, Jun 2013-Dec 2015
First spell: Won 124, drew 40, lost 21
Win percentage 67.0, points per game 2.23
Second spell: Won 80, drew 29, lost 27
Win percentage 58.8, points per game 1.98
Overall win percentage 63.6, points per game 2.12
The Portuguese established himself as a Chelsea hero, winning back-to-back league titles, one FA Cup and two League Cups in his first spell. His departure only a month into his fourth season by ‘mutual consent’ was unexpected but he returned in 2013. A third league title and a League Cup followed but a dismal start to the 2015-16 season saw him leave the club for a second time.
Avram Grant – Sep 2007-May 2008
Won 36, drew 13, lost 5
Win percentage 66.7, points per game 2.24
Appointed technical director in 2007, the Israeli controversially succeeded Mourinho. He lasted only one season, finishing second and losing the Champions League final to Manchester United, but has the best win overall percentage and points per game of any of Abramovich’s managers.
Luiz Felipe Scolari – Jul 2008-Feb 2009
Won 20, drew 11, lost 5
Win percentage 55.6, points per game 1.97
Brazilian Scolari was the first World Cup-winning coach to manage in the Premier League but a poor run of form saw him sacked before the end of his first season.
Guus Hiddink –Feb-May 2009, Dec 2015-May 2016
First spell: Won 16, drew 5, lost 1
Win percentage 72.7, points per game 2.41
Second spell: Won 10, drew 11, lost 6
Win percentage 37.0, points per game 1.52
Overall win percentage 53.1, points per game 1.92
Hiddink succeeded Scolari until the end of the season and combined his duties with his post as Russia manager. He lost only one match and won the FA Cup but could not be persuaded to stay. He returned with less success after Mourinho’s second departure.
Carlo Ancelotti – Jul 2009-May 2011
Won 67, drew 20, lost 22
Win percentage 61.5, points per game 2.03
Led Chelsea to a first ever league and FA Cup double, with his side becoming the first to score more than 100 Premier League goals in one campaign, but was sacked hours after finishing second in his second season.
Andre Villas-Boas – Jun 2011-Mar 2012
Won 19, drew 11, lost 10
Win percentage 47.5, points per game 1.75
Hailed prematurely as the new Mourinho, Villas-Boas’ tenure at Stamford Bridge was not a happy one. After talk of a player revolt, he was sacked with Chelsea outside the Champions League places.