“I left the club and went and won the league so... I do understand the reaction," Simpson said.
“I left that club when I turned down a contract and left on a free. It turned out OK for me but I understand it from their point of view.
“At the same time I played nearly 140 games for them and gave it my best. For the last I don't know how many years I was part of a team that was successful for them.
“We finished fifth and reached the quarter-finals of the Europa League. It didn't go too bad. I left and made the decision, and it was the right one."