The 32-year-old Belgian is out of contract in the summer and has a number of offers on the table but is interested in a move to London.
Frank Lampard wanted Mertens in January, despite the fact he turns 33 next week, as he can cover a number of positions.
Dries Mertens remains a Chelsea target with the Napoli star interested in a move to London
The Belgian international has 12 goals and six assists in 29 in all competitions this season
Chelsea’s priorities in the window are expected to be a striker, centre back and left back.
Mertens would definitely tick the box for the former, with the veteran on the cusp of being Napoli’s all-time record goalscorer.
He has spent seven seasons in Italy since arriving in an £8million move from PSV Eindhoven and has played 309 matches, scoring 121 times – making him the club’s joint-highest marksman with Marek Hamsik.
Mertens is comfortable operating across the front three or as a false nine, and wherever he lines up, he knows the route to goal having scored 12 and registered six assists in 29 games across all competitions this season.
Chelsea manager Frank Lampard is an admirer of Mertens and tried to sign him in January