The 27-year old defender was let go by the R's at the end of the 2013/14 Championship campaign despite helping them gain promotion back to the Premier League which is a decision that he feels was a little bit of a shock.
However, Simpson has settled well at the King Power Stadium and has indicated that he is thoroughly enjoying being a part of Nigel Pearson's Foxes setup.
"Football is football and you never know what will happen, but it was a shock when QPR told me I was leaving," he told the Leicester Mercury.
"I pretty much played every game last year and I was expecting to start this season, but it has worked out better for me because it is a club going in the right direction from top to bottom.
"They are a great set of lads here and I wanted to be in a team that is progressing and wants to do well in the Premier League. I think we have shown that already."
He added: "I knew a few of the lads anyway so it has been easy to integrate.
"Everyone is so close and so together. It is nice to walk into a group like that.
"Everyone works hard on the pitch and off it. Everyone demands 100 per cent from each other and it is easy to walk into that environment. Once you have that, you have a great chance of doing well."
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