Silva is out of contract at the end of the 2019-20 season and the 35-year-old is set to leave Ligue 1 champions PSG.
The Brazilian centre-back is reportedly open to re-joining Milan, where he won the Serie A title in 2011 before joining PSG the following year.
"In football anything is possible, but we have to wait to see what will happen because of the pandemic," Tonietto told MilanNews.it.
"He has great admiration for Milan, his years with them were those that marked his career.
"He knows about the fans' great affection for him."
Silva has won six Ligue 1 titles since moving to PSG, and 14 other pieces of silverware in the French capital.
Prior the postponement of Ligue 1 due to the coronavirus pandemic, Silva had made 21 league appearances and 30 across all competitions.