Marine first-team coach Chris Stammers has stepped down from his role with the senior squad.
He leaves after more than two decades in football, though he will remain involved with the Marine Academy.
He said in a statement: "It is a decision I have not taken lightly, but after 20+ years working in the semi-professional and professional game without a break, I need to recharge the batteries and give some time to myself and my family."
Stammers added that he had worked at the club for the last two seasons, and thanked the manager, his fellow coaching staff and the players. He said: "I will still be working for the club through the Academy and will do my best to produce more Potters and Huby's for the club and the Gaffer. As a I Marine supporter, I'll also get time to stand and watch games, with fellow supporters."