Ronaldo started his professional career with the Verde e Brancos, before he moved to Manchester United in August 2003.
The Portuguese great has just over a year to run on his Juve deal and is considering his options.
And with Sporting CP preparing for the Champions League in 2021-22, his mother told fans she would try to lure the European Champion back to the Primeira Liga.
“I will talk to him and try to convince him to return next year," Dolores said, quoted by TVI 24. “To the Alvalade Stadium and to wear the colours of Sporting."