The winger went under the knife in early July after a recurring injury forced him out of the Bafana Bafana camp for the 2017 COSAFA Castle Cup.
Initial reports suggested Ngoma, who scored seven goals and made 16 assists in 2016/17, faced around four months out but he is making good progress with his rehabilitation.
The Citizens, though, are also without fellow attacker Judas Moseamedi for their MTN8 opener with Polokwane City at Cape Town Stadium on August 12 (15h00). Moseamedi, on target six times last term, is expected back in September after damaging his knee in training.
City spokesman Julian Bailey said: "With the injuries, we've got Aubrey Ngoma. He has had his knee op, he is doing his rehabilitation and is actually ahead of schedule so that's great news for us. Then we also have Judas Moseamedi, who has got a knee problem as well. His recovery time is yet to be determined but we know that he won't be having an operation on it, so that's a bit of good news as well. I think that's the only injuries we've got at the moment, so everyone else is good to go."
Benni McCarthy's side have played Premiership champions Bidvest Wits, Cape Town All Stars, Milano United [prior to franchise sale] and Ubuntu Cape Town in pre-season friendlies, and will next entertain Ajax Cape Town on Thursday as they finalise preparations for their first match of the campaign against Rise and Shine.
The Telkom Knockout holders are still operating out of Green Point and will continue to host teams at CT Stadium and Athlone Stadium in 2017/18. However, club owner John Comitis is believed to be exploring other options, while his long-term plan is to secure their own 10-000 seater venue.
"We will be between Cape Town Stadium and Athlone Stadium for our home matches. That [own stadium] is a long-term goal for us, not something that can happen now. That's where we want to land in the future," added Bailey.
Ex-Ajax boss Comitis formed City just over a year ago when he bought the topflight status of Mpumalanga Black Aces. Eric Tinkler coached the team to TKO honours and a third-placed finish in the league before he switched allegiance to SuperSport United, prompting Comitis to hire Bafana Bafana legend McCarthy.