Roberto Martinez has said that football managers lose their jobs because the expectations of fans are "not realistic".

The Spaniard is in just his third season at Goodison Park, but is the fifth longest-serving manager in the Premier League following Brendan Rodgers's dismissal from Liverpool earlier this month.

When asked about managerial sackings at a press conference, the Everton manager told reporters: "I always felt that we were unique in the British game in that the figure of the manager was very different to anywhere else in world football. In any other league in world football, you are a head coach and you work with what you are given and if you get three defeats then you are out of the door.

"So I was always so proud of the British game because it didn't work like that. But what you have seen in the past few seasons, maybe because of the media focus expectations are risen out of proportions and the expectations of the fans are not realistic, but managers are being judged like a head coach.

"It is not anymore how you manager a football club from a financial point of view, how you introduce youngsters, how you set a football philosophy, it is more about the results and if you get three bad results you are going to be questioned. And that is a real shame."

Half of the 20 Premier League managers have been with their current clubs for less than a year.