Celtic started their campaign in the CAF Confederation Cup on a high note after beating Maniema Union 2-0 with a second-string side in Kinshasa on Sunday.
Harris Tchilimbou and Menzi Ndwandwe scored the goals to help Siwelele secure the crucial away win with Abram Nteo sitting on the Phunya Sele Sele bench in the absence of Maduka.
Celtic CEO Khumbulani Konco has assured Siwelele fans there is no reason to worry about Maduka's absence.
"Remember we were playing Black Leopards last week and the team left when we were playing that game, and that's the reason the coach remained behind," Konco tells snl24.com/kickoff.
Meanwhile, the DStv Premiership match between SuperSport United and Celtic that was set for Tshwane on December 9 has been postponed to give Siwelele a chance to prepare for the MTN8 final against Orlando Pirates on December 12.