The 20-year-old moved to Egypt earlier this season in a move reported to be around the region of R17 million.
However, he had been waiting to make his official debut for the Egyptian giants for quite some time despite receiving his paperwork weeks ago.
Mahlambi was introduced in the 63rd minute of Al Ahly's 2-0 win over Ismaily. At the time of his introduction, the scoreline was 0-0 between the two sides.
Now, the Johannesburg-born utility player will be eager to cement his his place in the team, and make the right-wing position his own going into the final few matches of 2017.
It remains to be seen if Mahlambi will be handed his first start when Al Ahly take on El Daklyeh on Friday night.