Jon is a strong defender who has spent time at Salisbury City and most recently at Chippenham Town where he remains on Conference South forms.
On completing his move Jon has said "I'm very pleased to have signed for Thatcham, I have heard great things about the club, the players and the management team. I just want to get back playing and help this club get up the table."
Manager Danny Robinson has confirmed he will be in the squad for Saturday's trip to Street.
All at the club would like to welcome Jon to Waterside Park and hope that he enjoys his time here.