The Canadian International defender came to a decision a short while ago, and speaking of the signing Town boss Joe Royle told the Official Club Website: "I am delighted Jason has decided to join us.
"He is a strong, outstanding centre-half who we hope will help keep our goals against column to a minimum and also provide us with an attacking threat from set-pieces.
"Jason's signing is a strong statement from this Club that we are not satisfied with fifth place in the table and we will be going all out to finish in the top two next season."
Click here for a profile on Jason De Vos and here for his record in the 2003/4 Nationwide League Season.