By Josh O’Brien Jadon Sancho has been accused of showing “red flags” long before he even joined Manchester United after his Old Trafford nightmare came to a temporary end. The England international joined the Red Devils in the summer of 2021 from Borussia Dortmund for a fee of £73million, but less than three years later Sancho finds himself back at the Bundesliga club on loan having fallen out with United boss Erik ten Hag in spectacular fashion. Ten Hag publicly revealed that Sancho’s performances in training left plenty to be desired back in September, which in turn inspired a response from …