Bundesliga strugglers Borussia Dortmund have agreed to sign Slovenia international Kevin Kampl in January.
Cardiff have agreed to sell Norwegian midfielder Mats Daehli to Freiburg in January.
Udinese president Franco Soldati revealed this afternoon that officials from Napoli were in the north east to finalise a move for the 26-year-old defender.
"The deal is almost completed," Soldati told Radio Kiss Kiss. "There are a few details to sort out before we will officially announce it. Napoli sporting director Riccardo Bigon is in Udine and he is talking to the player's agent."
Armero, who was signed from Brazilian side Palmeiras in 2010, has made 10 Serie A appearances this season.