A delegation from Manchester United has visited Glasgow Celtic's Parkhead home to examine its safe standing section.
The group headed north of the border following a growing clamour among fans to introduce rail seating at Old Trafford.
Sportsmail understands that United remain neutral on the issue but are open to introducing an area similar to that installed by the Scottish club, with a capacity of close to 3,000 should it be deemed legal and feasible.
The stadium is not thought to be structurally sound enough to support a large standing area but a small section of rail seating, similar to that at Parkhead, is an option.