Manchester United and Manchester City are set to be back in action when the Premier League returns later in June after a three-month hiatus, but only behind closed doors, and with clubs and players having to undergo testing on a regular basis.The Championship looks set to follow suit, while League One and League Two are likely to end their campaigns prematurely, with no indication as yet as to when they or non-league sides will be able to start the new season.Having invited member associations