6. Jamie Carragher
Although most inclusions on this list are players who left the Premier League to further their respective careers elsewhere, there have also been a number of crucial retirements in recent seasons that have left teams struggling to cope.
The retirement of Carragher is one of the biggest examples. The 35-year-old, who made over 500 appearances for Liverpool during a 17-year career on Merseyside, finally hung up his boots in May.
Despite Liverpool's blistering start to the new campaign in an attacking sense with Daniel Sturridge and Luis Suarez combining to devastating effect, they have looked somewhat substandard of late.
Brendan Rodgers' men lack the experience and composure that Carragher was always on hand to provide.