Spanish referee Antonio Mateu Lahoz decided to send Guardiola to watch the second half of the match from the stands after he angrily protested the official's decision to disallow a goal by Man City midfielder Leroy Sane, reports Efe.
UEFA announced on Wednesday that the City coach was charged with "improper conduct of the coach", adding that the case was scheduled to be dealt with by the UEFA Control, Ethics and Disciplinary Body on May 31.
UEFA also opened disciplinary proceedings against Liverpool for fan actions, including throwing objects and setting off fireworks.
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