Guardiola confronted the Crystal Palace goalkeeper at the end of Saturday's FA Cup final defeat.
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The Catalan was furious after seeing Henderson escape a red card for handling outside his area before then saving a penalty from Omar Marmoush.
Expert lip-reader Jeremy Freeman has revealed what Guardiola and Henderson said to eachother in a furious exchange at the final whistle.
Guardiola approached Henderson stating: "You didn't deserve that. Disgrace."
The goalkeeper replied: "You still had your 10 minutes", referring to the 10 minutes of injury-time.
Henderson said "10 minutes" three times, then Guardiola replied: "It's not fair play. You should not - it's not fair."