Foden was left out of the forthcoming England games by manager Thomas Tuchel, with the Three Lions facing Andorra in a World Cup qualifier on 7 June and friendly against Senegal at the City Ground three days later.
Asked if there was a conversation between club and country about the omission, Guardiola said: "I don't know about England national team. It's true he has been struggling a long time with his ankle.
"What happened with the national team belongs to Thomas."
City have a short turnaround after the Fulham game, travelling to the newly expanded Club World Cup in the United States, beginning their group campaign against Moroccan side Wydad AC in Philadelphia on 18 June.
Guardiola said Foden would "in principle" travel to America for the tournament, but he confirmed full-back Kyle Walker, who is currently out on loan at AC Milan, will not be with the City squad.