If there is one notable problem with modern day football, it's the incessant hiring and firing of football managers. No other club has seen more come and go in a merry-go-round of world-class managerial talent, than Chelsea FC.

In June 2003, Roman Abramovich became the owner of the companies that control Chelsea FC. And since that date, Chelsea and Abramovich have hired and fired 10 managers. Amounting to a ratio of one manager a year since Roman took over. Here's a look at the manager's that have reined under Abramovich, and that were deemed sackable by their performances and trophy count.

Claudio Ranieri: September 2000-May 2004: Games 200, Win ratio 54%;

Previous award(s): Copa del Rey in charge of Valencia, Coppa Italia in charge of Fiorentina.

Jose Mourinho: June 2004-September 2007: Games 185, Win ratio 67%;

Previous award(s): two Primera Liga titles, one UEFA Champions League and one UEFA Cup triumph with Porto. 

Awards at Chelsea: two Premier League titles, one FA Cup, two League Cups and an FA Community Shield.

He has since gone on to win the Serie A twice and claim another UEFA Champions League with Internazionale, A Copa del Rey and La Liga, with current club Real Madrid.

Avram Grant: September 2007-May 2008: Games 54, Win ratio 67%;

Awards at Chelsea: Premier League runner up, UEFA Champions League runner up and League Cup runner up.

Luiz Felipe Scolari: July 2008-February 2009: Games 36, Win ratio 56%;

Previous award(s): FIFA World Cup with Brazil.

Ray Wilkins: February 2009-February 2009: Games 1, Win ratio 100%;

Wilkins only took charge of one game as caretaker manager at Chelsea, and they won it 3-1 against Watford in the FA Cup.

Guus Hiddink: February 2009-May 2009: Games 22, Win ratio 73%;

Previous award(s): six league titles and a UEFA European Cup with PSV Eindhoven, and a semi-final appearance with Russia at UEFA Euro 2008.

Awards at Chelsea: FA Cup 2009.

Carlo Ancelotti: June 2009-May 2011: Games 109, Win ratio 61%;

Previous award(s): Intertoto Cup with Juventus, Serie A and two UEFA Champions League wins with AC Milan.

Awards at Chelsea: Premier League title, FA Cup and Community Shield.

Andre Villas-Boas: June 2011-March 2012: Games 40, Win Ratio 48%;

Previous Award(s): Primera Liga and a UEFA Europa League with Porto. 

Roberto Di Matteo: March 2012- November 2012: Games 42, Win ratio 57%;

Previous award(s): Football League Championship runner up with West Bromich Albion.

Awards at Chelsea: FA Cup, UEFA Champions League.

Rafael Benitez: November 2012-May 2013: Games 43, Win ratio 56%;

Previous award(s): Two La Liga titles and a UEFA Cup at Valencia. An FA Cup, FA Community Shield and a UEFA Champions League at Liverpool. A Super Coppa Italia and a FIFA Club World Cup with Internazionale.

Hardly a list of sackable managers wouldn't you say? With trophies coming from the vast majority of them, including Abramovich's much sought (and spent) after UEFA Champions League. It's hard to justify the decision to fire them at such free will. 

So have Chelsea lead by bad example, and set a trend that has caused a downward spiral of dispensable managers across the English Football League? 

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