The Italy international is currently undergoing a Napoli medical ahead of signing terms.
The deal, as is known, has been closed on the basis of an initial €9m loan fee, with an obligation to buy for an additional €26m at the end of next season. The deal will be worth a total of €35m.
Lucca arrived at Villa Stuart in Rome to undergo his Napoli medical today. He will then sign his new contract.
Once pen is put to paper, he will join his new teammates for the first part of the training camp in Dimaro, Trentino.