The defender from French Ligue 2 club Sochaux has left the Zambia camp in Lusaka on Wednesday due to a family bereavement following the death of his sister who died on the Copperbelt.
Zambia coach Honour Janza said he was not in a position to say whether Sunzu will be available for the second leg Group F fixture against Niger on Wednesday, October 15 at Levy Mwanawasa Stadium in Ndola.
“Everyone is aware he is bereaved. He will say whether he is ready to go or not,” Janza said.
“From a football side, we have to go forward, the game has to be played but it brings some challenges without him because he is part of this family but we mourn with him.”
Meanwhile, Zambia are at full strength despite Sunzu departure.
Sunzu’s departure means Janza’s will bank on eleven overseas call-ups for the match against Niger in a team that has seventeen home-based players.
Striker Jacob Mulenga of Turkish club Adana Demirspor was the last player to join camp in Lusaka on Tuesday.
Chipolopolo are due to leave for Niger on Thursday morning five thirty minutes flight on a chartered plane to Niamey.