Tim Krul, Achraf Lazaar and Emmanuel Riviere have been left out of Rafa Benitez's squad for Newcastle United's training camp in Ireland.
The club today revealed Benitez's 27-man squad.
Chancel Mbemba has also been left behind on Tyneside because of a "visa technicality".
Benitez has taken his players to Carlton House, Co Kildare today for a week-long training camp.
It is expected that Krul, Lazaar, Mbemba and Riviere will train with the club's development squad next week.
Young players Callum Roberts and Victor Fernandez have travelled.
However, Adam Armstrong has stayed behind on Tyneside amid loan interest from "a number of clubs".
SQUAD: Darlow, Elliot, Woodman, Clark, Dummett, Gamez, Haidara, Hanley, Lascelles, Lejeune, Sterry, Yedlin, Aarons, Atsu, Colback, Diame, Fernandez, Hayden, Ritchie, Saivet, Shelvey, Roberts, de Jong, Gayle, Mitrovic, Murphy, Perez.