Frank Lampard is in constant contact with transfer target Dries Mertens, according to reports.
The Napoli forward was heavily linked with a move to Stamford Bridge in January but ended up staying in Serie A with his contract set to expire in the summer.
And Chelsea have stepped up their pursuit of the Belgian, Italian transfer expert Vincenzo Morabito has claimed.
'Mertens had originally said he wanted to stay at Napoli, but then his lawyer started offering him to various international clubs, meaning something changed between the player and the Azzurri,' he told Radio Kiss Kiss Napoli (as reported by Football Italia).