The Brazilian keeper missed the 2-2 draw with Brighton and Bernardo was forced to come off just 18 minutes after coming on as a sub with an unspecified knock.
Regarding Ederson, Guardiola said: “[It is] something abdominal. He had niggles. At Nottingham Forest he had a problem and that’s why it happened.”
The boss added that he felt he had to bring Bernardo off to avoid making a knock he’d sustained any worse.
“It helps to not get injuries,” said the boss.
“The players are training well, and they are committed to do it. They are not used to [chasing Champions League qualification] but it’s fine.
“We lost at Nottingham Forest and they played well. Our spirit today was much better and we were aggressive.
“Brighton have won a lot of games in a row. We won the balls and second balls, and we make quick transitions. The goals were good and Savinho had chances.
“I have moments I can doubt, but I find the right way to be positive. Bernardo today, and Ederson is injured again. Things happen.”
Watch Pep’s post-match press conference by playing the video above...