Following Foden’s omission from the England squad, Guardiola was asked if there was a conversation between club and country bosses.
“I don’t know about England national team,” Guardiola said. “It’s true he has been struggling a long time with his ankle.
“What happened with the national team belongs to Thomas.”
England boss Tuchel told Radio 5 Live that he and Foden had decided it would be better for the player to take “a bit of time off” in order to “let him breathe” and “clear his head”.
The German boss said: “That hurts a lot because I love Phil as a person in camp, he was fantastic.
“I love him as a player. The talent is outstanding, but at the moment this is the decision.”
Tuchel added: “Maybe we have got so used to his highest level that we are now… worried, but I think there is no reason to be worried.
“I think it’s maybe just a dip in his development. Lately he needs to re-find the joy in his game. It’s not so easy, it is not falling easily into his feet. So yes, he is struggling, but he is still so young and still full of talent.
“I had a good phone call with him and everything is fine. We don’t need to talk about his talent, we will do more or less everything to bring him back to form.
“Hopefully, the main part is still on him, and he will come back.”
City have a short turnaround after the Fulham game, travelling to the expanded Club World Cup in the United States where they begin 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.