England's Alex Mitchell ruled out of entire Nations Championship with hamstring injury; Jack van Poortvliet set to start vs Australia

England scrum-half Alex Mitchell has been ruled out of the entire Nations Championship campaign after a scan on Monday confirmed the severity of his latest hamstring injury. The Northampton Saints player had already been doubtful for Sunday's opener against Australia, but the news is a significant setback for head coach Steve Borthwick. Mitchell's absence means Jack van Poortvliet is expected to start at scrum-half against the Wallabies, with the Leicester Tigers man now tasked with controlling the tempo. There are further concerns in the England camp as fly-half Fin Smith is also an injury doubt, adding to Borthwick's selection headaches. Mitchell's dynamism and kicking game have been central to England's recent progress, and his loss removes a key attacking threat. With the Nations Championship representing a new competitive format, England will need to adapt quickly. The depth of the squad will be tested as Borthwick reshuffles his half-back pairing for a challenging autumn series.