Mamelodi Sundowns and Al Ahly played to a 0-0 draw in the first leg of the Caf Champions League fixture played on Saturday.
The Brazilians struggled to get their flair in the first half despite having a lion's share of possession, as the Red Devils did everything possible to stop them from troubling their goalkeeper at the Loftus Versfeld Stadium.
Slovenian striker Nejc Gradisar had a massive chance to find the back of the net, but his header, from Emam Ashour's cross, came off the upright with Ronwen Williams well beaten.
In the 69th minute, Al Ahly thought they had scored a vital away goal, only for the offside flag to cut short Gradisar's celebrations.
It was the same case late in the game when Marwan Attia thought he had won it, but again, he was adjudged to be in an offside position.
Any win or scoring draw in Cairo will see Sundowns through.