Ngoma is yet to make his mark with the Absa Premiership champions since his January signing from Cape Town City.
The 29-year-old was named the PSL Midfielder of the Season and Telkom Knockout Player of the Tournament when he starred for City in 2016/17.
However, he suffered a bad injury towards the end of that campaign, and has only since played five times for the Brazilians.
Ngoma has faith his fortunes will change at the Tshwane giants.
"It is just a matter of getting match fitness. With match fitness comes confidence, self-belief," Ngoma tells KickOff.com.
"As I keep getting minutes on the field that'll improve my confidence and I can get back to my normal self."
Ngoma was last on the bench in August when Sundowns drew 0-0 with Horoya in the CAF Champions League at Lucas Moripe Stadium.
He was therefore grateful to get a rare look-in during the club's 2-1 win over AmaZulu in the Prince Mangosuthu Legacy Cup during the FIFA break.
"It was good to get some minutes in an unofficial match," said Ngoma, who was substituted towards the end of the friendly match in Ulundi, KwaZulu-Natal on Saturday.
"It was good to get a run out. I've missed playing football, just training doesn't really help much to improve.
"But to get on the field with opponents in a game like this that can only do you justice, to better your football and also improve the match fitness."
Ngoma joined Downs at the same time as Jeremy Brockie, Siyabonga Zulu and Gaston Sirino, with the latter the only one to hit the ground running at Chloorkop.