Opposition Leader Patrick Pruaitch said instead, Sir Mekere will use his extensive background and knowledge to mentor shadow ministers.
Besides being a former PM, Sir Mekere was the first Papua New Guinean to become Secretary of Finance and later was Governor of the Central Bank.
He also had a reputation as a reforming prime minister.
Pruaitch said: "The Alliance will highlight National Government policies that contribute to continual cash flow problems even though annual government revenues are billions of Kina more than available to any previous Government and likely to hit an all-time high this coming year."
Pruaitch further reiterated that the major policy thrust for the Opposition in the 10th Parliament will be exposure of corruption and malpractices of the Government; a task that will be spearheaded by the Member for Sinasina-Yongumul, Kerenga Kua.
He said Kua's areas of responsibility cover 'Democratic Institutions and Rule of Law', which include roles as Shadow Minister for Justice & Attorney General, Police, Correctional Services and Defence.