Komphela quit cash-strapped Celtic in December for a host of reasons, which were listed in a resignation letter that did the rounds on social media and painted a poor picture of how the club was being run.
Asked about facing Phunya Sele Sele for the first time since his exit, Komphela said: "Emotions will always be there but I have to be professional.
"During any situation on the field you have to be professional, then your human behaviour can come when you are alone."
He added: "When you get praised or criticised, stand firm even though it won't be easy, but we need to apply some principles."
Komphela, who started his reign at Arrows with a 2-0 win over Maritzburg United, is obviously well versed with what threat Siwelele will pose at Dr Molemela Stadium.
"We've profiled them, we are now prepared and on the day we will have to participate," Komphela said.
"In terms of profiling I know them, it is an advantage for us to prepare. We will just have to participate and be ready for whatever they bring to us.
"If they have a second option we will need to adapt."
A contingent of Celtic fans have vowed to boycott the match on the weekend to show their unhappiness with club owner Max Tshabalala and his management team.