Jackson Martinez scored the only goal in the 57th minute as Porto claimed a first-leg advantage over Napoli
Napoli live updates
Reports in the Italian media claim Napoli have contacted Liverpool about the availability of the Reds' Danish centre-back Daniel Agger.
Napoli midfielder Giandomenico Mesto will be out of action until the new year after undergoing knee surgery, the Serie A club confirmed.
The three-time Italy international hurt his right knee in Saturday's win over Catania and went under the knife on Monday to reconstruct a torn cruciate ligament.
Some Marseille fans didn't take defeat to Napoli very well last night.