Walter Mazzarri oversaw his first training session at the Castel Volturno ground, with striker Victor Osimhen still sidelined.
Osimhen was expected to return after recovering from a thigh strain sustained in an international friendly on October 13.
However, he was expected to make his return this week, but the plan suffered a set back.
The club cited flu symptoms as the cause, leaving fans eager for his return ahead of the upcoming clash with Atalanta on November 25.
