The defender was involved in a first-half clash with Manchester United striker Rasmus Hojlund

Mr Richards denied allegations by the defence that he had claimed to see the headbutt because he was ‘Roy’s mate’ and ‘stooge’

Scott Law, 43, of Waltham Abbey, Essex, has pleaded not guilty to a charge of common assault.

United were outclassed by Manchester City in a one-sided derby at Old Trafford.