The candidate, who will be chosen by a ballot of party members in London, was originally due to be announced on August 12th.
However the results of the contest will not now be known until September 2nd.
The revised schedule was announced as the party confirmed the names of those seeking the nomination.
Former Haringey Councillor Brian Haley joins defeated MP and reality TV star Lembit Opik, former Met Police Deputy Assistant Commissioner and 2008 candidate Brian Paddick and outgoing London Assembly Member Mike Tuffrey on the list of Mayoral hopefuls.
Tuffrey, backed by the LibDem’s 2000 candidate Baroness Susan Kramer, and a majority of 2012 London Assembly candidates is widely expected to secure the nomination.
The revised timetable is as follows:
July 18: Postal ballot sent to members in London
July 27: London all-member hustings
August 31: Deadline for returning ballot papers
September 2: Count and declaration of result
