Pakistan's embattled President Asif Ali Zardari has asked former minister Aitzaz Ahsan to act as a mentor to his son Bilawal if anything were to happen to him, sources said,amid reports that the outspoken PPP leader is being tipped as a likely replacement for Premier Yousuf Raza Gilani. Zardari had reached out to Ahsan,one of Pakistans leading lawyers and former interior minister,after he became embroiled in the controversy over a secret memo that sought US help to stave off a possible coup in Pakistan following the killing of Osama bin Laden. During a long phone conversation with Ahsan while he was in Dubai to seek treatment for a heart condition,Zardari had asked the Cambridge-educated lawyer to act as a mentor to his 23-year-old son Bilawal if anything were to happen to him, senior PPP officials and other sources said. Zardaris decision to ask Ahsan to speak after him at a massive rally on Tuesday also triggered speculation that Ahsan may be given a key position in the government. The president was expected to be the main speaker at a public meeting organised by the PPP at Garhi Khuda Baksh,in Sindh,to mark the death anniversary of his wife,former Premier Benazir Bhutto. Zardari took everyone by surprise by effusively praising Ahsan and asking him to deliver the final speech. Reports in a section of the media said that Ahsan was being tipped as a likely replacement for Gilani. One report quoted an unnamed presidential aide as saying that the possibility of replacing Gilani with Ahsan was being considered as a serious option. Ahsan denied that he was being considered for the post of premier. You have to be (a parliamentarian) to be prime minister, he told The News daily. Though Ahsan acknowledged he could be elected to parliament through a bye-poll,he questioned why anyone would do so for such a short term. The current National Assemblys term ends in early 2013. Sources said the pressure on the president from military over the memo scandal had forced Zardari to re-evaluate his options regarding the future of both the PPP and Bilawal. It was in this context that he asked Ahsan to play a role in guiding Bilawal,the Chairman of the PPP,the sources said. Zardaris abrupt visit to Dubai earlier this month fuelled speculation that he might be forced out of the presidency by the army.