Rio Ferdinand has insisted that Manchester United star Kobbie Mainoo should attempt to emulate the success of two talented players in the Premier League. Kobbie Mainoo has enjoyed a stunning season so far for Manchester United and the teenage sensation has been widely praised after his emergence in the first team. The 18-year-old United midfielder missed the early stages of the campaign due to injury before returning to the squad and making a lasting impression at Old Trafford. Mainoo has become a key midfield figure for United manager Erik ten Hag and impressed with his confidence and calmnes…