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The 36-year-old has been in good form for Juventus this season, scoring 28 goals in 32 Serie A appearances for Andrea Pirlo's side, but his future is in doubt with only one season remaining on his contract at the Old Lady.
Juve are at risk of missing out on a Champions League qualification spot for next season as they currently sit fifth in Serie A with just two games to play.
And with the Italian outfit on the verge of missing out on European football, Ronaldo's mother Dolores - a lifelong Sporting Lisbon fan - added fuel to the fire by claiming she will persuade her son to join Portuguese giants.
In a video filmed by a fan at a street celebration, Ronaldo's mother Dolores said: "I'm going to go to Turin and speak to him.
"Next year he will play in Alvalade, I'll convince him and he will return."
Despite being 35-years-of-age, the Portuguese superstar's valuation will still be pushing the nine-figure mark.
His contract doesn't expire until 2022, meaning Juventus will likely demand to recuperate the €100m they shelled out for him just two years ago.
Ronaldo came through the academy system at Sporting Lisbon and made 31 senior appearances for the Portuguese side before making his move to Manchester United in 2003.
The stalwart attacker joined Juve in 2018 and has scored 100 goals and registered 22 assists for the club.
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