Former Oldham Athletic youngster Umba joins Chaddy after recently being released by the League Two outfit.
Chadderton have fought off a number of interested parties to obtain the acquisition of the highly-sought after player.
The 16-year-old is a versatile player who is capable of filling the void on the left-hand side of midfield and at left-back, as a second striker and as a central midfielder.
Chadderton boss David Fish gave his thoughts after capturing Umba's signature, he told the club`s website: "A young man who we've been aware of for a while, Georges has looked good in pre-season.
"Georges is a natural athlete and skilful player whose game intelligence allows him to play anywhere on the pitch. Recently released from Oldham Athletic's academy where he played centre-half. I believe he has the potential to make an impact in the first-team this season."
Assistant-manager Lee Ashworth, who has taught Umba at secondary school for five years, admitted he was thrilled the youngster opted to sign for Chaddy.
Ashworth said: "I immediately spotted the talent Georges possessed when he came to my school in Year 7. He's an athlete who has lots of ability. It was myself who helped Georges into the academy setup at Oldham Athletic - where he remained for five years until being released as a 16-year-old.
"Georges has so much potential and a fantastic attitude - I'm positive he'll continue to go far."
Chadderton also announced the arrival of highly-rated goalkeeper Jordan Hadlow from Manchester Premier League outfit Manchester Central.
After a string of impressive performances for Central throughout the last campaign, Fish swooped to secure the services of the sought-after youngster.
The 20-year-old was an ever-present last season, starting all 32 games as Paul McGuire's side finished second in the First Division to secure promotion and lifted the Murray Trophy, following a stunning victory over Tintwistle Athletic in the final at Ewen Fields.
It was in the latter competition where Hadlow demonstrated his best form having produced a number of stunning saves during penalty shoot-out victories over both Chadderton`s reserves and Tintwistle.
Commenting on the club's latest acquisition, Fish said: "Jordan is a keeper who impressed me in the game I watched when he played against our reserve team last season.
"He is agile, a good communicator and has a presence and maturity that belies his age. His attitude in pre-season training has been excellent and the competition between him and Danny Havern to take the first-team number one shirt, is one I think will bring the best out of them."
EDS midfielder Kenan Dewar has also signed NWCL forms with Fish's first-team.
Dewar, 20, is an energetic midfielder who has been at the club for a couple of seasons having shone for their elite development squad.
After an impressive campaign with the club's youngsters, Fish has opted to reward the former Stalybridge Celtic man with an opportunity to sign first-team forms.
Speaking after securing Dewar's services, Fish said: "Kenan has been around the club for a while and has looked good in pre-season.
"A big, strong, combative midfielder who can also play. His versatility will also be a positive. He looks ready to make the step up to the North West Counties League and will have the chance in pre-season to stake a claim".