Angola have been unpredictable in two draws under Serb coach Srdjan Vasiljevic, impressing when holding Tunisia before giving a mediocre performance against Mauritania.
Mauritania v Tunisia
Tunisia have been one of the flops of the Cup of Nations so far, taking only two points from uninspiring displays against Angola and Mali.
Coach and former France star Alain Giresse has reacted angrily to public criticism that he is not starting midfielder Ferjani Sassi.
“Ferjani is returning from injury and needs rehabilitation in order to return to his full level,” said the 1980s midfielder.
After a 4-1 hiding from Mali, debutants Mauritania tightened up to draw 0-0 with Angola and hopes of a shock win could hinge on shackling in-form Tunisia forward Wahbi Khazri.