Ronaldo has gone on to become one of the all-time greats since leaving Sporting to join Manchester United for £12.24million as a teenager in 2003.
Ronaldo joined Juventus three years ago and with his contract due to expire in 2022, the 36-year-old's future has been the subject of speculation with Andrea Pirlo's side in danger of missing out on Champions League football next season.
The five-time Ballon d'Or winner's mother, Dolores, has been celebrating Sporting's first Primeira Liga title in 19 years.
And she hopes her son can play a big role in helping the famous Lisbon club add further honors.
"I will talk to him and try to convince him to return next year," she was filmed by TVI 24 saying. "To the Alvalade Stadium and to wear the colors of Sporting."
Sporting defeated Boavista 1-0 on Tuesday to be crowned champions of Portugal for the first time since the 2001-02 season.
Ronaldo scored his 100th Juve goal in a 3-1 Serie A victory at Sassuolo on Wednesday.