Jack is no stranger to Oxford City fans after appearing for the Hoops 19 times last season on loan and now re-joins the club until the end of the season.
Last season, a string of positive performances led parent club MK to recall the highly rated young defender from City to feature in their first team squad, as MK went on to secure a League One play-off spot in the process.
Davies spent the first-half of this season on loan at fellow Vanarama National League South side Concord Rangers.
Everyone at Oxford City would like to wish Jack the very best of luck with us during his loan spell.