The 33-year-old has been a key performer at Napoli for seven seasons, but is out of contract this summer.
And it is reported today that a move to Antonio Conte’s Inter is ‘one step away’, with documents being exchanged.
Mertens will arrive at the San Siro on a free transfer, replacing Alexis Sanchez who will return to Manchester United.
It is added that while Inter are clearly in pole position, Chelsea are not yet out of the race.
Mertens has scored 90 goals since his €9.5m move from PSV in 2013. He has won 90 caps for Belgium, finding the net 18 times.