John Mikel Obi and Victor Moses are not among Chelsea players listed for the London club’s pre-season tour to Austria.
Their omission is due to their involvement in Nigeria’s 2014 World Cup campaign this summer.
Like the Super Eagles duo, Eden Hazard, Romelu Lukaku, Thibaut Courtois, Oscar, Ramires and Andre Schurrle have also all been omitted after their extended World Cup campaigns.
Chelsea’s new summer signings, Cesc Fabregas, Diego Costa and Filipe Luis, were named in the 26-man squad as were youngsters Patrick Bamford, Nathan Ake, Jeremie Boga, Lewis Baker, Nathaniel Chalobah and Izzy Brown.
Mohamed Salah also travelled with the squad after receiving confirmation that he would not have to return to Egypt to do military service.
Chelsea kick off their European tour against Austrian Bundesliga side RZ Pellets before taking on NK Olimpija Ljubljana, Vitesse Arnhem, Werder Bremen, Ferencvaros and Real Sociedad.