He said: "I am happy here. I decided to stay because I came back from Southampton and won the supporters over again.
"It was a difficult decision not to go to Newcastle. I remember coming up here on a Friday night ahead of our league game at Old Trafford.
"That night I was thinking about the players who I had encouraged to come to Portsmouth, who I had told what we could achieve. And I thought to myself, ‘I can't have done that and then just walk away'. Newcastle are a fantastic club but I made the decision and I am happy with it.
"It is easy for people to say ‘You should have taken the challenge on'.
"If I was 40 I might have done. But I didn't want to be away from my wife and my grandchildren. Also, I have a great team here."