The 31-year-old has been in imperious form since joining the club and was on the score sheet as they thrashed Al Shamal 7-2 on Sunday.
Ayew put Xaviâs side 3-1 up on the 15th minute after Ali Assadalla and Baghdad Bounedjah had earlier netted on either side of Mohsen Al Yazidiâs equaliser.
Al Sadd continued to dominate in the second half and add four more goals to put their opponents to the sword at the Jassim Bin Hamad Stadium.
Ayewâs strike against Al Shamal is his third goal of the season, having made a bright start to life in the Qatari topflight.
The Ghana international netted his debut goal for Al Sadd against Qatar SC and scored again during last weekâs league game against Al Rayyan.
He has now scored in three successive matches for the Qatari giants, who currently sit at the top of the league table with 12 points.
âBig win today and another goal. Alhamdulillah. Great team spirit, we keep going,â Ayew tweeted after the game.
Meanwhile, Ayewâs rich vein of form will delight many Ghanaians, with the Black Stars set to take on Zimbabwe in a double-header World Cup qualifier in October.