The Zambian defender penned a three-year contract with the Tshwane giants in the recently concluded transfer window.
The 25-year-old Chipolopolo international was recruited from Power Dynamos, who he joined in 2014.
"Billy has signed for three years," says an official at SuperSport.
"We are currently waiting for his papers and hopefully it will be sorted out soon."
MTN8 champions Matsatsantsa reached the final of the competition on the weekend by edging Kaizer Chiefs 1-0 at FNB Stadium.
Kaitano Tembo's men will meet Cape Town City in a repeat of last year's final on September 29 at a venue still to be announced.