Kobbie Mainoo and Ruben Amorim (Photo by Justin Setterfield, Carl Recine/Getty Images)Manchester United have reportedly been given an ultimatum by one of their players over the future of struggling manager Ruben Amorim. To make things worse for Amorim, it seems that Man Utd midfielder Kobbie Mainoo already has serious reservations about this project, and is determined to leave if the manager isn’t replaced. That’s according to a report from Fichajes, which states that Mainoo has given up on things improving at United under Amorim. Would Kobbie Mainoo exit be for the best for everyone? At this stage, it’s harder and harder to imagine Mainoo continuing at United.