Investigative and forensic lipreader Nicola Hickling told OLBGthe following was said:
Pep Guardiola: “This is not a friendly, this is not a friendly.”
Dean Henderson: “Get stuffed” as he walks behind Guardiola.
Pep Guardiola: Turns around and he shouts: “what?”
Camera change.
Dean Henderson: “Look, the game has been played fair, sir.” (He raises his hands when he says sir).