Juventus president Andrea Agnelli travelled to Greece on Tuesday to meet Cristiano Ronaldo.
Ronaldo's $110 million transfer from Real Madrid to Juventus nears completion.
Massimiliano Allegri and Ronaldo spoke on the phone last Friday.
Ronaldo's contract is due to expire in 2021.
The lengthy case brought against him by the Spanish tax office -- which, according to sources, was settled last month when the former Manchester United player agreed to pay a total of €18.8m -- is another reason cited for his desire to leave Spain.