Witsel is also being linked with Chelsea ahead of the January market.
Boca Juniors‘ Rodrigo Bentancur is also a Juve target.
“I won’t deny that we’re working for these two players,” the director confirmed.
“We have a right of first refusal for Bentancur which expires in April 2017 and we’ll redeem him. We won’t sign him in January, but next year.
“Witsel is an opportunity, because his contract expires in 2017. We’ve had contact with Zenit to sign him sooner, and we remain in contact to get the final answer.”