Arrows were the better team at the King Goodwill Zwelithini Stadium with goals from Sede Dion (15') Isaac Cisse (75') and Thokozani Khumalo (87', 92') in a one-sided clash.
Since then both teams have lost, with Gallants going down 1-0 to Durban City and Arrows losing 3-1 to Orlando Pirates.
But speaking ahead of the game, Lafitte explained that his focus is on securing silverware for his team this season.
He said in the Sowetan: "This game is different. It's very important to learn from your mistakes. When we played Arrows last week, we added more numbers forward after conceding the first goal, and we ended up being vulnerable at the back. The cup game is different, and the approach will be different.
"We know it's a very important moment for the club to be in the semi-finals, especially because we know in the championship we don't play to win the title, so with this cup we have an opportunity to win something.
"It's very important for us to qualify for the final."
Gallants beat Mamelodi Sundowns and Stellenbosch to secure their semi-final place.
The young head coach added: "Arrows are a very good team, so we need to fight very hard. We must be united [and] apply the same mindset we applied when we played Stellenbosch in the quarter-finals and Sundowns in the first round.
"I believe we’re ready for the challenge.
Orlando Pirates clinched the Carling Knockout Cup in dramatic fashion at the New Peter Mokaba Stadium, edging Marumo Gallants 1-0 after extra time to secure their second trophy of the season.
Marumo Gallants' goalkeeper Washington Arubi says his side is comfortable being labelled the underdogs ahead of Saturday's Carling Knockout final against Orlando Pirates.
Orlando Pirates face Marumo Gallants in the Carling Knockout Cup final at Peter Mokaba Stadium on Saturday as they attempt to win their second trophy this season.
Orlando Pirates captain Nkosinathi Sibisi is keeping his focus sharply on the Carling Knockout Cup title as his team tops the Betway Premiership table with 28 points after 12 games.
