The Kampala-based side beat Madagascar's Elgeco Plus 4-3 on aggregate to set up a first round date at Orlando Stadium.
"They are not a bad side but I don't see them giving Pirates trouble," Onyango tells snl24.com/kickoff.
"They don't lose at home but again they are not good travellers. I don't see them getting the results against Pirates.
"Again it's going to be a huge game for them coming to Orlando. Every team playing against Chiefs, Pirates and Sundowns always wants to fight."