It was a heartbreak at the end for Iran side Foolad, who looked to have sealed a famous win against the Qatar champions.
Al-Sadd started strongly by pressing Foolad into its own half, but the Iranian side was able to hold its ground as it eventually pushed the Qataris back, setting the stage for an exciting tie.
The deadlock continued well into the second half but with a noticeable change in Foolad’s approach, who was now on the front foot.
Chimba scored for Foolad with a header in the 61st minute but Khoukhi equalized the match with one mnute remaining.
Al-Sadd will take on hosts Al-Nassr next on Saturday, while Foolad will face Al-Wehdat.