Swansea manager Roberto Martinez has warned "a massive war" could be triggered if an independent tribunal overturns a 15-point penalty imposed on the Yorkshire club.
An arbitration hearing got under way behind closed doors on Wednesday in London where Leeds' lawyers are attempting to show the Football League acted outside their jurisdiction when docking the points at the start of this season.
If the sanction is overturned Leeds would be thrust into the second automatic promotion place at the expense of Carlisle with three matches remaining.
Swansea, who celebrated automatic promotion last weekend with victory at Gillingham, would no longer be guaranteed their place in the Championship.
Martinez: "I think they may get some points back.
"But it would be unfair from a football point of view if their position in the table suddenly changed and, if I'm honest, I can't see that happening.
"Leeds are in a play-off position and I think they should stay in a play-off position.
"If anything else happens, you won't have heard the last of it because teams like Tranmere, Southend, Nottingham Forest, Doncaster, Carlisle and ourselves will all be affected.
"Everyone will take their own route and it would be a massive war."
The tribunal could last for up to three days.