City go to Liverpool on Sunday on the back of five defeats and a draw in their last six games.
Guardiola said, "I mean that we have to rebuild, yes. We don't have players.
"We play six weeks without four centre-backs and two defensive midfielders. It is not sustainable."
He added, "I want to stay. The day it doesn't feel positive I will leave. But I want this opportunity. I will not run away.
"To rebuild the team in many ways for the rest of the season, and next season. I want that challenge and the opportunity to do that. I know what we need to do."
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