Former Leyton Orient chairman, Barry Hearn, has called for financial transparency over West Ham’s move to the Olympic Stadium. 

The iconic venue is currently being adapted for football but the costs have rocketed to £272million so far, with the Hammers only contributing £15million under the original deal. 

But the mayor of London Boris Johnson has refused to reveal the amount the club will pay in rent during its 99-year lease, citing "commercial confidentiality". 

Hearn, chairman of the O's for nearly 20 years, said the public has the right to know. 

"Who is it confidential from? I can't see any reason whatsoever why it should be secret," Hearn told BBC Sport. 

"The actual deal West Ham has got is still confidential and our current mayor of London is refusing to reveal details. 

"As a taxpayer, I find that quite confusing. When people spend my money, I rather like to know what it's been spent on. 

"In the absence of that information we can only speculate that it is a deal so beneficial to West Ham that it becomes questionable in its own right." 

Hearn fought for Orient to share the Olympic Stadium with the venue's eventual tenents but lost a legal challenge to have the original bidding process overturned. 

In a previous statement, Boris Johnson said: "We've created a knockout venue that will drive and sustain thousands of jobs, where we've ensured that a hefty share of the profits will be paid back into the taxpayer's coffers and which provides a genuine Olympic legacy for our city." 

"West Ham, with the Olympic Stadium, in my view will become one of the major clubs in Europe within four or five years," added Hearn. 

"It doesn't take a genius to say this could have a decimating effect on Leyton Orient. 

"It's a shameful situation that the powers-that-be have not taken this into account. When they use the word legacy, they should get a dictionary and see exactly what it means."