Runaway Serie A leaders Napoli have some injury concerns after Stanislav Lobotka, Piotr Zielinski and Amir Rrahmani trained separately from the squad.
A statement on the club website confirmed that the three players are carrying knocks and mainly worked in the gym this morning.
The Partenopei will take on Spezia at the Stadio Alberto Picco on Sunday at 11.30 GMT.
It remains to be seen if they will be risked from the start in that game or left to rest.
Meanwhile, the flu bug that hit Kvicha Kvaratskhelia last month has seemingly now spread to midfielder Tanguy Ndombele as well, so his participation is also in doubt.
Napoli are having an extraordinary season, suffering only one defeat to Inter on January 4, along with 17 victories and two draws.
They have scored 48 goals and conceded just 15.
There will also be the Champions League Round of 16 against Eintracht Frankfurt, with the first leg in Germany on February 21 and the return on March 15.