Railway and Tube lines, an underground river and an adjacent cemetery will pose challenges to owner Todd Boehly and could force the club to rotate the pitch 90 degrees to stay on the current site.
Chelsea also intend to dig several metres deeper than the current pitch due to height restrictions.
The club face a minimum of four years away from Stamford Bridge should they decide to rebuild it. Boehly is determined to transform the stadium into a world-class venue, which would mean not retaining any of the current stands
. It is understood Chelsea will be required to build decking over the London Overground railway line in order to demolish the East Stand
. One option would be to make the decking permanent, to create more space for the new construction.
Chelsea are expected to find out this month whether they have acquired a 1.2-acre site next to the stadium for £50m.
The land belongs to Stoll, a housing association which provides housing for military veterans.