Matsatsantsa CEO Stan Matthews announced at the club's awards function held last week that September will retire after the 2015/16 season to take up a role within United's development structures.
September looked back on his career with no regrets having won three league titles and two domestic cups since joining the Tshwane-based side in 2006 from Bush Bucks.
Chiefs were reportedly after his signature in 2010 but the versatile defender opted to stay at United.
"I don't regret the Kaizer Chiefs decision at all," he says.
"It's not a secret, I was in negotiation with them [Chiefs] but I had to make a decision for myself, family and my career and after a lengthy meeting with Stan Matthews, I saw SuperSport United as long-term.
"In terms of money, I could have got a quick-fix at Chiefs but I wasn't ready for that back then. With my injuries and the years they were offering me, I don't think I would have had a long career there so I still feel I made the right decision."
September's troubling knee injuries is the primary reason why the defender is hanging up his boots when the upcoming season concludes.
"The 2015/16 season is my last, four operations on one knee is not good and I don't want to be crippled when I'm done with football. I can't handle the pressure the knee is giving me. It's my last season, I'm calling it quits.
"It was not an easy decision, I'm only turning 33 [in November] this year but it [decision] was beyond football.
"SuperSport United have offered me a position at the club and we will decide before the season ends which area would suit me best. My businesses are doing well so I'm not worried about life after football."
He adds: "I've done Level D coaching. I understand football but I don't know if I'm patient enough to work with youngsters and understand the mistakes they will be doing. Coaching is not in me yet, hopefully by December I will have made my decision in terms of how I would like to position myself.
"I want another league title, winning it three times in a row was fantastic. I've won cups as well but the league is something special. It's a marathon and when you win it, you get to defend it the whole season and you're also called champions the whole season, that's why it's the big one. The incentives are better than for other cups."