By David McDonnell This summer promises to be one of significant change in terms of Manchester United’s squad, with as many as 12 players on their way out. But amid the expected huge exodus and new signings, five current players are certain to remain and form the spine of United’s side going forward, whether that is under Erik ten Hag or a newly appointed manager. Here, Mirror Football looks at five players who will be central to United’s revival under Sir Jim Ratcliffe and his new football operations team as they look to kick-start a new era and bring the glory days back to Old Trafford. Andr…