Ronaldo has been linked with his old club this season.
But even if Cristiano doesn't eventually make the move, mum Dolores Aveiro has an alternative plan: "It did not happen this year, let's see if it will be next. God willing.
"If Ronaldo does not come, his son, Cristianinho, will come. I promise.
"He is his successor. If the wishes of a mother and a grandmother are fulfilled, the near future of one of her children will be at Sporting."
Like Ronaldo, son Cristianinho is also on the books at United.