The players "gathered at the training facility for medical check-ups and fitness assessments. Victor Osimhen was not present and provided a medical certificate," stated Napoli in a short announcement.
A crucial player in Napoli's title victory in 2023, Osimhen spent the previous season on loan at Galatasaray, netting 26 goals in 30 league appearances as the Istanbul team secured their 25th Super Lig title.
Napoli manager Antonio Conte appears to have no plans for the 26-year-old in his squad for the upcoming Scudetto defense, but Napoli will not let Osimhen go for less than €75 million.
Discussions with Galatasaray, which have been ongoing for several weeks, are still stalled over the payment terms for the transfer.
Napoli recently signed Kevin De Bruyne from Premier League team Manchester City, but the 34-year-old Belgian was absent from the players who reported for training on Monday.