Gundogan, signed from Borussia Dortmund during the summer, made a belated City debut on Wednesday with Silva absent.
Guardiola said: “I think tomorrow he [Silva] will not be able to play, I don’t think. I haven’t seen the doctor and David, I don’t think it’s a big problem but it happened two days ago so I don’t think he will be able [to play].
“I don’t know if Ilkay can play again so quickly, I’ve been thinking about it since two days ago. He played well but we cannot forget that he comes from a long-term injury. We will see tomorrow, today we are going to see the doctor and we will decide.”