Napoli have agreed personal terms with Jackson Martinez, but his agent has warned that getting Porto to sell may be more problematic.
The Colombian striker has been linked with a switch to the Stadio San Paolo, but more talks will be necessary.
“There is an agreement with the player,” Manuel Manzo told Sky Sport Italia. “However, one with Porto is missing and they don’t want to sell.
“The only chance of a move happening, in my opinion, is if the Azzurri pay the €40m rescission fee clause which is in his contract. Otherwise he won’t move.”
Napoli, after spending €37m on Real Madrid’s Gonzalo Higuain, are understood to have bid €32m for the South American.
Napoli are rumoured to have offered Jackson Martinez a five-year deal worth €2m a campaign in an effort to tempt him to Serie A.
The 26-year-old joined the Portuguese club last summer from Jaguares.