Other names in the frame include Sir Brian Pitman, previously the chairman of Lloyds TSB and a non-executive director of Carlton, and John Nelson, a former City banker.
Pitman is being touted as a potential stop-gap replacement while a long-term alternative is found. Nelson's ties to Granada are said to count against his selection.
Green agreed on Tuesday morning to resign from the chairman-designate role after pressure from Carlton investors, led by Fidelity.
Granada's decision to back shareholder calls for the appointment of an independent, non-executive chairman left Green stranded.
Observers believe Charles Allen, Granada's chief executive and the proposed chief executive of the merged ITV, will survive the shareholder unrest.
One analyst said: "Charles has done enough in that he was one of the key architects of the behavioural remedy and was involved in the lobbying for the merger."
ITV is still to name a sales chief for its merged operation. It is said to be conducting an extensive interview process for this and other roles.
The IPA expressed concern that the disarray at Carlton would delay the merger process. Jim Marshall, the chairman of the IPA media futures group, said: "If there is going to be a problem, it's the big issue of getting the remedy mechanism sorted out and probably what's gone on at ITV in the last week or so will delay that a little bit."