The midfielder moved last January from Everton.
"I didn't know how much I was going to play but to get in the team and play the amount of games I have in the last two years in unbelievable. The way I have got on with the players, the staff and the fans has been great.
"My family are happy here so I think I made the right choice coming [to the club] and that is not disrespectful to Everton. I felt it was my time to leave after what I did there and go on to a different challenge."