Borough manager Alan Lewer said: "Jan's a big friend of mine really and I've kept in contact with him right back from his Kidderminster days and I can't believe he’s not in football at the moment.
"He has so much to offer and his experience is immense and I've said to him if he's not fixed up does he fancy coming down to do some coaching for me and getting involved and he said he'd be delighted.
"From my point of view and for the people of Nuneaton it should be a massive boost."
He joins former Liverpool team-mate Mike Marsh in the coaching ranks at Manor Park, after he was recently appointed Lewer's assistant.