Ngcobo spent last season on loan with Gladafrica championship outfit, TS Sporting.
The 25-year-old goalkeeper was linked with a loan move to Golden Arrows last year before making a switch to Mpumalanga.
TS Sporting has since decided against keeping Ngcobo next season as the club look forward to sign a new goalkeeper next season.
"Ngcobo has gone back to Mamelodi Sundowns. The team will not retain him for next season," said the source close to the club.
Sundowns currently have six goalkeepers in their books including Abram Ngcobo, Dennis Onyango, Kennedy Mweene, Ryan Pieterse, Ricardo Goss and Jody February
Meanwhile, TS Sporting has concluded the signing of midfielder, Nkosinathi Ononogbu from JDR Stars.
Ononogbu spent last season on loan to Black Leopards. According to soccer agent, Pontso Madumo, Ononogbu has joined Sporting together with Olwethu Ncube and Tumisang.
"All three are my clients and have joined TS Sporting," Madumo confirmed to snl24.com/kickoff.