The lukewarm reaction comes a week after the prime minister name-checked the mayor as a possible successor.
London's mayor was named by Cameron as one of three possible future Tory leaders when the Prime Minister ruled out running for a third term.
Mr Cameron ruled out a third term as Prime Minister if the Tories win the election in May.
The London Assembly is demanding to know how much money will be repaid to taxpayers if the club is sold.
The prime minister is said to be under pressure from Tory MPs to exploit the mayor's popularity in the run-up to the general election.
Boris Johnson is to renounce his US citizenship, removing a potential obstacle to becoming Prime Minister.
A plan to bring America's biggest museum to the Olympic Park is still not a done deal, Boris Johnson has admitted.
The technology was shown to Boris Johnson during his visit to an anti-terrorist surveillance hub at the New York Police Department.
The London mayor described Mrs Clinton as like a 'sadistic nurse in a mental hospital' in his newspaper column in 2007.
Michael Bloomberg served three terms as Mayor of New York before retiring from front line politics last year.