Tolisso has been a key figure for Lyon this term after turning down a reported €37.5million move to Napoli ahead of the 2016-17 campaign.
He has scored 11 goals in 37 appearances in all competitions for the Ligue 1 giants, leading to reports that the 22-year-old could receive further interest from Serie A - with some claiming a deal with Juve is already in the pipeline.
Tolisso was quick to reject those rumours, though, and committed his future to Lyon.
"I have not signed anything with Juventus," the midfielder told L'Equipe.
"I have a contract with Lyon until 2020, so that should answer all questions about whether I am still here next season."