TOKYO (Reuters) - Japan"s 3 megabanks belonging to Mitsubishi UFJ Financial Group 8306.T, Sumitomo Mitsui Financial Group 8316.T and Mizuho Financial Group will be among lenders to extend loans to Nippon Telegraph and Telephone Corp (NTT) 9432.T for its potential acquisition of NTT Docomo Inc 9437.T, two sources said. MUFG Bank will extend the biggest amount, the sources, who are familiar with the matter, told Reuters, declining to be identified because the deal is not official yet.