ISLA MABAD (INP) - In the wake of the settlement of a row between Pakistan and the US over CIA contractor Raymond Davis, Pakistans ambassador to US Husain Haqqani is likely to be replaced after expiry of his tenure in May, sources said. In a significant development, the vacant slot of foreign minister may soon be given to Assef Ahmed Ali, a senior PPP leader and former education minister, Gulf Times reported on Saturday. Haqqani is blamed for issuing hundreds of visas to the likes of Davis, a CIA contractor arrested in Lahore in January for killing two Pakistanis, without observing the prescribed rules and regulations such as the vetting of applications by Pakistani security agencies. Despite the settlement of the row over Davis, Pakistani security agencies are displeased with the way the Pakistani embassy issued visas to Americans during Haqqanis tenure that led to the influx of hundreds of CIA-linked people and defence contractors to Pakistan in the garb of diplomats. Haqqani is blamed for issuing over 400 visas to Americans in a single day in July last as the row between Islamabad and Washington over visa issuance was resolved upon the intervention of the presidency. These visas were blocked earlier after complaints were received in Islamabad that a lot of 'dubious characters had applied for visas. and were being obliged, a diplomatic source said. He said it was highly unlikely that Haqqanis contract would be renewed after the expiration of his current one in May and he would be replaced by some career diplomat. However, the source refused to reveal the name of Haqqanis likely replacement. When approached, a Pakistani official did not confirm or deny the possible replacement of Haqqani. However, he said important changes were imminent in the countrys foreign services, adding that the slot of foreign minister which became vacant after the removal of Shah Mahmood Qureshi was likely to be given to Assef Ahamad Ali, a senior politician of Pakistan Peoples Party.