Who is Papy Djilobodji?
It is a question that, four months on from his arrival, Chelsea fans are still asking themselves.
The former Nantes defender was mocked across social media as the club’s birthday tweet to him reminded many he still remains part of the Blues’ squad.
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With that in mind here are five other Chelsea defenders to struggle at Stamford Bridge.
Forget Steve Sidwell, Fernando Torres and Mateja Kezman – Khalid Boulahrouz was the worst number 9 to ever play for Chelsea.
The Dutchman, who signed for the club in the summer of 2006, was part of the side that relinquished the Premier League crown to Manchester United the following year.
His poor performances failed to trouble John Terry and Ricardo Carvalho, whose consistency limited Boulahrouz to just 20 appearances across all competitions.
He is currently a free agent and is widely regarded by many to be one of Jose Mourinho’s worst-ever signings.
Tal Ben Haim
Despite having a respectable career in England with Bolton and Portsmouth, Tal Ben-Haim found Chelsea to be too big a leap.
The 33-year-old, who was sent-off against the Blues in the Champions League last month, signed on a free transfer in 2007 but fell out of favour after Mourinho was replaced by Avram Grant.
As well as Terry and Carvalho he also found Brazilian defender Alex too difficult to dislodge and was allowed to leave for Mark Hughes’ Manchester City after one solitary year at Stamford Bridge.
Consequent loan spells with Sunderland, Portsmouth and West Ham United followed and he spent last season in the Championship with Charlton Athletic.
Just like Liverpool fans, Chelsea fans were not too keen on Glen Johnson either.
The Stoke City right-back was brought to the capital as a youngster from rivals West Ham but failed to shine during Mourinho’s first spell in charge.
However, he is rebuilding his career at the Brittania Stadium, with teammate Jack Butland tipping him for a recall to the English national side. Yet even if he does return to Roy Hodgson’s side, few at Chelsea will be looking on with any feeling of regret.
Winston Bogarde was certainly one of the worst players to ever don the colours of the club.
The Dutchman is infamous around Stamford Bridge after refusing to sacrifice his wages of £40,000 in favour of first team football elsewhere.
He made just 12 appearances for the Blues yet pocketed £10million in wages, though has since admitted to feeling hurt during his time at Chelsea.
Bogarde is now retired and applied for the vacant Oldham managerial position earlier this year.
Though conventionally an attacking player, Yuri Zhirkov was often played at full-back during his time with the Blues.
A summer signing made by Carlo Ancelotti in 2009, the Italian believed he finally had Chelsea’s answer to Manchester United’s Cristiano Ronaldo.
However, the Russian international was a big flop and did precious little to justify his £18million price tag.
He was then sold by Andre Villas-Boas in 2011 just one year before Chelsea lifted the Champions League.
Can you think of any more terrible past Chelsea defenders? Give YOUR opinion in the comment box below!