The Buccaneers eased to a 3-0 first round win over Amakhosi and come into this tie in some impressive form as they chase an elusive Betway Premiership title.
Ouaddou's charges are in first place on the league standings with five games of their season to play - but just one point clear of second placed Mamelodi Sundowns, who have a game in hand.
Chiefs are, meanwhile, chasing a third place finish, with 46 points from 24 game, and are unbeaten in their last six games, including five wins.
"In sport and in this job [of being a coach] you need a lot of humility. Once you reach the target and stop working, that's the beginning of the end.
"So, we approach this derby with a lot of humility, not thinking too much about the result of the previous derby," Ouaddou said ahead of the game, in the Sowetan.
"Sunday is another game, different context, different environment, Kaizer Chiefs have been in a very good shape over the last six games but we focus on ourselves and how we want to attack that game."
"We will need everybody; players who will start, the impact players from the bench and our fans as well.
"Our fans have been fantastic since the beginning of the season. They are our 12th man and we feel that when our fans are behind us, we fly," Ouaddou added.
Orlando Pirates face Kaizer Chiefs in the 182nd Soweto Derby at FNB Stadium on Sunday, with significant implications for the Betway Premiership title race and the battle for a top-three finish.
Orlando Pirates striker Andre de Jong says he hopes to play his part in Saturday's Soweto derby after watching the 3-0 first round victory from the bench.
We take a look a look at the five key talking points ahead of the Soweto derby between rivals Orlando Pirates and Kaizer Chiefs at FNB Stadium on Sunday.
Nkosinathi Sibisi has emphasised the importance of execution over emotion ahead of Sunday's high-stakes Soweto Derby, insisting that Orlando Pirates must translate their intent into three crucial points against Kaizer Chiefs.
