The Spaniard spoken glowingly about the qualities of Stefan Ortega, who will play in the FA Cup this weekend.
City take on Newcastle United in the quarter finals, with Ortega lined up to start at the Etihad on Saturday.
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He's proven himself since he arrived with incredible quality performances," said Guardiola to reporters.
We're delighted with all three keepers at the moment but when he's had to play he's performed unbelievable.
Eddie (Ederson) is getting better. Hopefully he'll be ready after the international break."