Dlamini was recently suspended by the National First Division side after refusing to take orders from Mathebula in one of the team's training sessions last week, and instead opted to walk off the pitch.
According to Mathebula, Dlamini is still part of the club and is only suspended at this stage, but he did not rule out the likelihood of him leaving the club completely.
"You know a suspension is followed by processes, [his sacking] it's not final yet, the coach is still there, he is still on the team's payroll, so there is a process," Mathebula tells KickOff.com.
"It's a problem that happened at the ground, so it's a disciplinary matter where this needs to be done properly, so that it is fair. That's what I believe needs to happen.
"I'm glad the team did well this week while we are still putting together this thing, because we need people to sit in and talk about it. It's still sub judice this thing, it's still a matter to be discussed."
Mbombela beat Tshakuma Tsha Madzhivhandila 2-1 in their first game without Dlamini on Sunday.
"This weekend we had coach Eddie [Edward Williams], the assistant, on the bench and I think he did well. He did very well. He is suspended [Dlamini] but that does not mean it cannot happen [his sacking]. But we will be waiting for the outcome of the DC," Mathebula continues.
"It's a question of carrying out instructions and all that, and subsequently walking off and all that, it was a [practice] session. The instructions, they were from me, what was happening is... there was a session on Monday, we were supposed to have an interaction and he was not there.
"I show my responsibility for the team financially and otherwise, and therefore I can't just be sidelined. We need to get relevant people to come and sit on these things [hearings], so they need to give us time. But next week it's FIFA weekend, we will have time to discuss."