Duarte side were dealt a huge blow to their campaign following their 2-0 loss to Orlando Pirates at Orlando Stadium on Saturday evening.
Sfaxien are now siting in last place, with one point from four games in Group B, and have no chance of catching up to Pirates or Zamalek, who both have nine points.
The Portuguese coach has congratulated the Buccaneers, and believes the South African side can go the distance in this year's Confederation Cup.