Defender joins on loan.
This season, he has made two appearances for Sam Allardyce's side, both in the Capital One Cup.
18-year-old Potts made his debut last season for the Hammers, playing at left back against Barnsley in a 1-0 victory.
The U's have ventured into the loan market ahead of Saturday's visit to MK Dons with the addition of West Ham full back Dan Potts.In the meantime, he has been a regular in the London team's U21s squad and will now come to the Weston Homes Community Stadium on an initial month's loan, which runs until the game at Walsall on December 22nd. Dan will wear shirt number 41 in his time at Colchester United and his move will be completed subject to the usual paperwork clearance.