Tau is currently out of favour with Bafana Bafana coach Hugo Broos.
Al Ahly have claimed back-to-back Champions League titles and hope this season to become the first club to win the 61-year competition three times in a row.
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Out-of-favour South Africa winger Percy Tau scored twice as Al Ahly began their CAF Champions League title defence by hammering Gor Mahia of Kenya 3-0 in Nairobi on Sunday.
After Ramy Rabia had put the record 12-time African champions ahead on 14 minutes, Tau netted 60 seconds later and completed the rout after 74 minutes in a second round, first leg qualifier.