Celtic beat Pirates 1-0 last weekend and next face Komphela's former employers Chiefs at FNB Stadium on Wednesday.
Siwelele are only due to host Absa Premiership champions Sundowns in February.
“Things you don’t want to say are that when you play Chiefs, Pirates and Sundowns, logic dictates that the expectations are that they have to win,” Komphela said.
“So it is good to play them because they’re not your direct competitors, it's not a direct confrontation. So when you play against them and you get good results it builds your character, it helps your confidence.
“If the opposite happened again, you can still say, 'No, listen, we have our own competitors or our counterparts, or teams of our stature or calibre that we can compete against'.
“So when you play Chiefs, Pirates or Sundowns, it’s easier. When you get results, it’s tops.”
Komphela resigned from Amakhosi in April after a Nedbank Cup semi-final loss to Free State Stars condemned the Soweto giants to three years without a trophy under his watch and triggered a fan riot at Moses Mabhida Stadium.
However, Phunya Sele Sele have started this season with three straight victories despite the club's financial problems and reports of an imminent sale.
Komphela is determined to keep his men grounded.
“The objectives as a coach, you don't change them because of a result over 90 minutes,” he said.
“But as it is, the players we currently have are good enough to take Celtic to a position that is quite respectable. This is football ... you never know what’ll happen.
“If we keep our feet on the ground, work hard and understand that we are as strong as we think, the only far (sic) should be in the light that we see stuff.
“But we should also want to get to the darkness, so that we see what is there. But if we remain curious we shall achieve.”