The biggest problem was the pressure I was putting myself under

Ex-Liverpool manager Kenny Dalglish

Souness had a triple heart by-pass in 1992

In February 1991, Dalglish announced his shock resignation as Liverpool manager after a roller-coaster 4-4 cup tie with Merseyside rivals Everton at Goodison Park.

The stress of the job caused him to have a painful attack of shingles before the tie.

Dalglish led Liverpool to the double during his first season in charge and added two more League titles and another FA Cup to the Anfield trophy cabinet during the following four campaigns.

When the Scot stood down as manager Liverpool were three points clear at the top of the table.

He said: "The biggest problem was the pressure I was putting myself under in my desire to be successful.

"I felt it would be wrong to mislead everybody into thinking that everything was fine with myself."

Stein died during a World Cup qualifier

But it is not only Liverpool managers who have suffered from health problems brought on by the stress of the job.

Ebullient Peterborough boss Barry Fry has had three heart attacks during his time as a manager.

The first of them came when the manager was helping to push the Barnet team bus after it had broken down.

Meanwhile, in 1996 Steve Coppell left after just 33 days in charge of Manchester City because of ill health.

Three years later Joe Kinnear was rushed to hospital after he had a mild heart attack before his Wimbledon side played Sheffield Wednesday.

He stood down as manager three months later due to continuing ill health.

But the most tragic example is that of Jock Stein.

The legendary Scot suffered a fatal heart attack during Scotland's World Cup qualifier against Wales on 10 September 1985.