Paris Saint-Germain and Chelsea are also reportedly interested in Bosnia-Herzegovina international Pjanic.
As Juve return to training this week amid the coronavirus pandemic, Pjanic shared a cryptic message via social media on Thursday.
Pjanic wrote: "The Future Depends On What You Do Today. Happy To Be Back On The Pitch."
The 30-year-old joined Juve from Italian rivals Roma in 2016.
Since moving to Turin, Pjanic has won three consecutive Serie A titles to go with Coppa Italia and Supercoppa Italiana honours.
Prior to COVID-19 suspending Serie A in March, Pjanic had scored three goals and supplied two assists in 22 league appearances.