Motha, who was also on the wanted list of Polokwane City, has penned a three-year contract with United.
Chilli Boys boss Chippa Mpengesi tells KickOff.com: "He has signed with us. He started training with the club yesterday."
Mpengesi adds that Doctor Mampuru, Siyabulela Shai and Walter Maponyane have likewise secured permanent deals with the Premiership returnees.
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