Willcock was appointed manager in October 2018 following the departure of Mark Fell to Lancaster City.
He made 31 appearances for the club as a player, scoring 17 goals between 2000 and 2002.
In a statement, he said: “It is with strong emotions that I announce my decision to resign as manager of Ramsbottom United. I am proud of the progression of the team that I will leave behind. I have thoroughly enjoyed the last two half years spent as manager and I am grateful for the opportunity that the chairman gave me to manage a club that I had previously played for.
"During the time that I have been at the club, it has been a rollercoaster of a ride with some memorable moments and games that will forever be remembered. These memories were only made possible through the hard work and perseverance of a group of dedicated players and a supportive management team who have been truly committed. I would also like to thank the fans and volunteers, alongside the development team and juniors who have shown great support to myself throughout my tenure.”
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