The agents of the former Fulham -midfielder work on the Premier League transfer market and have already made contact with Manchester United and Manchester City.
Zambo-Unanguissa is a contract in Napoli at the end of June, although the Azzurri has the option to extend by 12 months.
The sun says that agents are now in contact with both Manchester clubs, they are trying to put a Premier League in line.
Zambo-Unanguissa played a key role this season in the title of Napoli under Coach Antonio Conte.