National League opponents for U's.
The match will be played on the weekend of December 5th - we'll have more details in the coming days.
Managed by Lee Sinnott, the U's opponents sit 19th in the National League, the same level as the U's Essex neighbours Braintree.
The U's progressed past Wealdstone on Saturday, whilst Altrincham sprung a shock as they beat Barnsley 1-0.
Colchester United will face Altrincham in the Emirates FA Cup Second Round after the draw was made on Monday evening.