According to a report in the Evening Standard, a nine-page document was being sent today to the Premier League chief executive Richard Scudamore which details the Orient case.

The club fear West Ham's move to Stratford could cost them up to £1.5 million ($2.4 million) a year, figures on which they will base their claim for damages.

At the heart of Orient's case is their belief that the Premier League has ignored its own rules by giving West Ham permission to move after the 2012 Games.

Section 6.5 of Rule I states that the League would allow a club to move grounds provided the switch "would not adversely affect clubs having their registered grounds in the immediate vicinity of the proposed location".

Orient have asked the League to provide a response to their questions by March 8.

They have made it clear that High Court action is a possibility if the League do not reverse their decision or explain more thoroughly how they reached it.

West Ham's plans to reduce ticket prices dramatically if they move to the Olympic Stadium have alarmed Orient.

The club fears it would lead to the loss of up to 30 per cent of the average home crowd.

Orient’s chairman, Barry Hearn (pictured), wrote to the Premier League late in November to express his concerns, but it is thought he did not receive a reply before the League decided on December 9 to sanction a move for either West Ham or their bidding rival Tottenham.

Hearn then held talks with Scudamore on February 18.

Orient are represented by law firm Mischcon de Reya, which represented the late Princess Diana in her divorce case, and has built up a specialism in sporting cases.

Orient have already appealed in writing to the London Mayor, Boris Johnson, the Culture Secretary, Jeremy Hunt, and Eric Pickles, the secretary of state for Communities and Local Government.

A 10-page document was despatched last Friday, with copies also going to West Ham and to the Olympic Park Legacy Company which was responsible for the initial decision over which of the two vying Premier League clubs, if any, should take over in the Olympic Park.

Now, Orient have turned their sights on the League.

The club are confident they have a strong case as they believe the Premier League have made their decision too hurriedly.

A source close to the matter told Standard Sport: "The Premier League should be panicking.

"They have made the decision in a bit of a rush, especially when you consider West Ham's plans to reduce dramatically ticket prices.

"In sanctioning the move to the Olympic Stadium, the Premier League have made a decision that favours their own club and ignores a third party.

"Orient have a strong case both for a judicial review and for legal action."

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