https://www.bbc.co.uk/sport/football/49795407
The news has been welcomed by the Manchester United Supporters' Trust, who said: "We have fought long and hard for safe standing for many years.
"We believe it will likely benefit atmosphere but also enhance spectator safety in areas where fans already persistently stand.
"As a supporters' group, naturally supporter safety is our number one priority, so we hope that this added safety measure is put in place sooner rather than later.
"Every game that passes without rail seats in place to prevent fans at Old Trafford getting injured falling over the existing conventional seats is an opportunity missed to make the stadium a safer place."