Twenty-three-year-old Jeffrey signed for the U`s in the summer after being released at the end of last season by Forest Green Rovers, for whom he played in the 2016 National League Promotion Final before spending last season on loan at Boreham Wood.
A former Arsenal junior who appeared for the Gunners’ under-21 side, he has also played for Wycombe Wanderers and Welling United.
Jeffrey, who has made eleven appearances for the U’s this season, will go straight into the squad for the game at Leyton Orient tomorrow.