One of the conditions of the trial is that there are designated safe-standing areas in both the home and away sections inside the Theatre of Dreams.
The club had 1,519 barrier seats installed in the North East quadrant during the summer and around 500 more will be added to the away section, with work set to be completed in late December.
United are also committed to reviewing other areas of the ground that may be suitable for barrier seats.
We are one of five clubs whose applications for safe-standing trials have been approved, along with Cardiff City, Chelsea, Manchester City and Tottenham Hotspur.