The former Chelsea ace admits he is incredibly relieved now the club is safe from the drop.
He said: "I knew it would be difficult but I was 100 per cent convinced the club would stay up.
"I would not have forgiven myself if I could not have kept the club up. I have become stronger. It has not been easy, trust me. It has not been easy at all. But my managerial skills have gone up.
"It has been a very, very difficult and tiring season.
"I recover very quickly from my difficult moments but I will talk about that at the end of the season."