Gaxa limped off the field after sustaining a knee injury during the second half of the quarterfinal game against Free State Stars at the same venue at the weekend and was replaced by Derrick Spencer.
The Bafana defender is hoping that he will recover by tomorrow.
“One of the Free State Stars’ players fell on my knee when we fell after contesting for a high ball. I tried to ignore the pain, but it became worse and I decided to ask the technical team to replace me.
“My injury is getting better and I am sure I will be back at training on Wednesday.”
Gaxa has tells KickOff.com that he is expecting a very emotional game on Sunday.
“It’s going to be tough, but I am already looking forward to going up against my former teammates.
Besides the injured Gaxa, the Brazilians must also be concerned about midfielder Esrom Nyandoro, who walked off the pitch in extra time after sustaining what is suspected to be a hamstring injury.
Sundowns were also without defender Mbulelo Mabizela and striker Sibusiso Zuma, who, according to PRO Sammy Mashabane, suffered knocks during training last week.
Defender Michael Manzini also sat among the fans when the Brazilians played against Ea Lla Koto for some unknown reason.
Meanwhile, Sundowns’ coach Trott Moloto has told the club’s website that he won’t be rushed into fielding newly-signed striker Collins Mbesuma.
Mbesuma has been given a tentative three-year contract.
The Zambian hitman must prove himself in the first season before the other two can take effect.
Moloto said the former Kaizer Chiefs and PSL topscorer continues to be under a special physical training programme.
“We are under no pressure to play him. We don’t want to rush him before he regains the desired physical condition. He is being closely assessed to make ensure that he is fully fit before he starts playing,” Moloto adds.