Lafitte's side have endured a difficult start to their Betway Premiership campaign with just three wins from their opening ten games.
Their recent 2-1 victory over Chippa United ended a run of six games without a win, and they followed that up with a surprise one-side showing against Stellies.
A brace from Phillip Ndlondlo and further goals from Monde Mphambanisi and Edgar Manaka sealed a fine performance at the Dr Molemela Stadium on Wednesday, and a semi-final clash with Golden Arrows - who they also face in the Betway Premiership on Sunday.
Lafitte said in the Sowetan: "I am so happy because it's not easy to qualify for the semi-finals of any cup competition.
"More than anything, it's the fact that we didn't concede a goal that makes me happy. It also pleases me that we managed to score four goals.
“My boys did a very good job. This is a very important result for us. The game plan was executed very well tonight; hence, I give my players credit.”
Marumo Gallants coach Alexandre Lafitte says the 4-0 defeat to Golden Arrows in the Betway Premiership last weekend is motivation to reach the Carling Knockout final.
Golden Arrows coach Manqoba Mngqithi says he is expecting a 'different' Carling Knockout Cup semi-final match against Marumo Gallants at King Zwelithini Stadium on Sunday.
TS Galaxy returned to winning ways with a 2-0 victory in the Betway Premiership over Stellenbosch at the Mbombela Stadium on Sunday.
Golden Arrows head coach Manqoba Mngqithi has showered praise on winger Siyanda Ndlovu, describing him as one of the most exciting football talents in South Africa today.
