Sam Allardyce has sent a very strong message to West Ham United co-owner David Sullivan about David Moyes. Former West Ham United manager Sam Allardyce worked under David Sullivan for four years at Upton Park from 2011 to 2015, before being replaced by Slaven Bilic. David Moyes then took over from Bilic in November 2017 before being moved on six months later. However, the Scot returned to the London Stadium in December 2019, and has managed to completely transform us as a club. That said, his tactics have become stale and unambitious, leading to calls from the West Ham fans for him to be moved…