Manchester United are planning to build a 100,000-capacity stadium in the next six years, ESPN reports.
A final decision on whether the club will build a new stadium or redevelop Old Trafford will be taken before the end of the year.
The project will cost over £2 billion and should be completed by 2030.
United co-owner, Sir Jim Ratcliffe, had previously said he would prefer to build a new stadium on the site of the existing stadium.
This would mean potentially using land behind the Stretford End for the expansion.
Officials from United have looked at similar projects across the world, but particularly from SoFi Stadium and the surrounding regeneration project near Los Angeles.
