The Belgium international midfielder has been linked with a summer move to the French capital and would be open to a transfer to Ligue 1 should they approach Zenit St Petersburg
The Belgium international joined Zenit from Benfica in the summer of 2012 but struggled to settle in at the Russian giants and has recently been linked with a move away.
PSG are supposedly closely monitoring the 24-year-old's situation in Russia and Witsel has now revealed that he would be open to a transfer to France.
"I am completely focused on Zenit at the moment but PSG are one of the clubs that leave no player indifferent. It would be hard to turn them down," the midfielder told La Derniere Heure.
"There's not a lot I can say about it because I don't know much about their interest. Things can move pretty fast in football, though."
Witsel has a contract with Zenit until the summer of 2017.