Manchester United managing director says club might have to go 'homeless' for a while to increase Old Trafford capacity to 90,000 with extra tier on Sir Bobby Charlton stand

Manchester United will be 'homeless' if they want to expand Old Trafford to a capacity of 90,000.

According the managing director Richard Arnold, any attempts to add an extra tier to the Sir Bobby Charlton stand would be a massive engineering challenge.

The work that would be required to expand from the current capacity of 76,000 will have to take place over a number of seasons, if plans are given the green light.

Arnold told South China Morning Post: 'We haven't left the easiest stand until last.