Speaking to the club's official website, Spencer said: "Wigan Athletic has been my life for the past 24 years and it has been an incredible journey. To think that we are in the Premier League for a 6th season is another testament to all that has been achieved here and it's going to be very strange not being involved on a day to day basis any more.
"But of course, I will be watching avidly and cheering on the team from the sidelines."