By Karolina Tagaris ATHENS (Reuters) - New ministers in Greek Prime Minister Alexis Tsipras' government were sworn in on Saturday after a reshuffle expelled dissidents from his cabinet and began a new phase of negotiations for a third bailout package. Tsipras sacked hardline former Energy Minister Panagiotis Lafazanis and two deputy ministers on Friday in a change that marked a split with the main leftist faction in the ruling Syriza party following a rebellion over the bailout terms. Panos Skourletis, a close Tsipras ally who left the labour ministry to take over the vital energy portfolio, said the reshuffle marked "an adjustment by the government to a new reality".