The Olympic Park Legacy Company (OPLC), who chose West Ham as the first choice to move in to the Olympic Stadium after the 2012 Games, appointed auditors Moore Stephens to investigate their own internal stadium procedures six weeks ago.
The OPLC board is meeting later on Monday. An OPLC spokesman could not comment on the results of the investigation.
It was triggered when Dionne Knight, the OPLC's corporate services director, was suspended after having worked as a consultant for West Ham during the bid to move into the £486million stadium.
She was immediately suspended on full pay while any possible conflict of interest was investigated.
She had declared a personal relationship with Ian Tompkins, a West Ham director, when she started at the OPLC. She only told the legacy company of her work at the club after a Sunday newspaper claimed she was on West Ham's payroll.
The Moore Stephens review has concluded there is no reason to reopen the bidding process, according to the BBC.
West Ham, in a joint bid with Newham Council that was picked ahead of London rivals Tottenham, plan to retain the running track after moving into the stadium.
They intend to convert the 80,000-seater venue into a 60,000-capacity arena for football, athletics, concerts and community use.
The club plans to move from their current Upton Park home in 2014-15.
Newham Council have arranged £40million to convert the stadium after 2012.
Tottenham have been looking at a legal challenge over the stadium decision.