Brian McDermott is the latest name to be added to the list of managerial casualties, after the 51-year-old coach was sacked by Reading earlier this week, following a run of four successive Premier League defeats.

The Royals' 2-1 home loss against relegation rivals Aston Villa on Saturday, prompted Russian owner Anton Zingarevich to wield the axe on a man who has been part of the Berkshire club's backroom staff for the past 13 years.

They say that loyalty is a dying trait in the world of football, and McDermott's departure only emphasises the cut-throat industry of England's top-flight.

Fickle fans that regard his removal as the right decision, should be reminded that it is only 35 days since McDermott was named Premier League Manager of the Month for January, after an impressive run of just one defeat in seven games at the turn of the year.

After revitalising Reading's hopes of survival in their debut campaign back among England's elite, following last season's charge towards the Championship summit, some might say that McDermott has been a victim of his own success.

In truth, after taking temporary charge at the Madejski Stadium in 2009, McDermott has consistently overachieved, with the Royals' promotion back to the Premier League - that he orchestrated against the odds - arguably coming too soon for a club that has failed to invest significantly enough, to give themselves any real chance of staying up.

Reading are not the only club guilty of parting ways with their manager prematurely, as fellow newcomers, Southampton, disposed of Nigel Adkins - the man that guided them to back-to-back promotions - in January, with the squad seeming to have overcome an early season blip and start to find their feet in the Premier League.

Queens Park Rangers also relieved Mark Hughes of his duties back in November, with the Rs rock-bottom of the table without a single Premier League victory to their name. Loftus Road officials opted to bring in Harry Redknapp, in an attempt to steer QPR to safety; an assignment that still remains in the balance, with nine games remaining.

If the former Tottenham boss fails to keep the west London club afloat, he could be forgiven for looking over his shoulder too, because the average tenure for a QPR manager based on the last 10 years is just 10 months - the worst record in the entire Premier League.

Southampton sit second on the trigger-happy list, with an 11 month average, having appointed and sacked 11 managers over the past decade, while Newcastle United complete the top three, having got through 10 gaffers in the same number of years.

Chelsea chairman Roman Abramovich also has a reputation for quickly hiring and firing, so it's no surprise the Blues occupy fourth place having had nine different managers in charge of first-team affairs during the Russian's ownership.

The growing impatience of Premier League owners is a trend that is increasing at an alarming rate, with only one club - Manchester United - having kept the same manager since the inception of England's top-flight.

Sir Alex Ferguson's 26-year tenure at Old Trafford is unlikely to ever be emulated, with the 71-year-old Scot's unrivalled achievements placing him amongst the games greatest ever coaches in the world.

Arsenal and Everton are the only two other sides currently plying their trades in the Premier League, to have had the same manager for over a decade, with Arsene Wenger and David Moyes also sufficiently settled at the Emirates Stadium and Goodison Park.

For a full list of Premier League clubs' average managerial tenures over the past 10 years, including how many bosses each have employed during the past decade, check out the table below. All stats come courtesy of The Sun.

Premier League average manager tenures:

1. QPR - 10 months - 12 managers

2. Southampton - 11 months - 11 managers

3. Newcastle - 12 months - 10 managers

4. Chelsea - 13 months - 9 managers

5. West Ham - 15 months - 8 managers

6. Tottenham - 17months - 7 managers

7. Aston Villa - 17 months - 7 managers

8. West Brom - 20 months - 6 managers

9. Swansea - 20 months - 6 managers

10. Fulham - 20 months - 6 managers

11. Norwich - 20 months - 6 managers

12. Sunderland - 20 months - 6 managers

13. Liverpool - 24 months - 5 managers

14. Manchester City - 24 months - 5 managers

15. Wigan - 30 months - 4 managers

16. Reading - 30 months - 4 managers 

17. Stoke - 60 months - 3 managers 

18. Everton - 120 months - 1 manager

19. Arsenal - 120 months - 1 manager

20. Manchester United - 120 months - 1 manager

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