OLYMPIC DELIVERY Authority (ODA) chairman Jack Lemley resigned last week amid concerns for the 71 year old's health.
Lemley was also thought to have been unhappy with the appointment of the CLM joint venture as the ODA's Delivery Partner (NCE 21 September).
He was understood to have favoured the rival bid by US giant Bechtel.
The rumours were categorically denied by an ODA spokesman.
The ODA also dismissed reports that Lemley was unhappy with the size of the ODA's budget, currently under review and due to be revealed in its Corporate Plan next year.
In a statement Lemley said he had resigned because he wanted to return to his US engineering consultancy, Lemley International in Boise, Idaho.
Lemley said: 'It has been a privilege to chair the ODA for the past year and lead the organisation through its formative stages.
'The Delivery Partner has been appointed and the ODA is ready to move to the next stage of its development. 'I am keen to return to the helm of my international construction consulting m in America, which is increasingly busy with major contracts.' Lemley joined the ODA at its inception at the start of this year, after being handed the role in November 2005, four months after London won the right to host the 2012 games (NCE 24 November 2005).
ODA board chairman Sir Roy McNulty will lead the organisation as acting chairman, working with ODA chief executive David Higgins until a permanent successor is found. The ODA said Higgins would not be moving to the role of chairman.