Bengaluru: Infosys has retained Jayesh Sanghrajka, deputy chief financial officer who had resigned in October, and given him additional responsibilities including driving the company's merger and acquisition strategy, people familiar with the development said.Sanghrajka was also made the interim CFO for a few months until Nilanjan Roy took charge as the CFO of the Bengaluru-headquartered software services exporter. Roy replaced Mavinakere Ranganath, who quit last year.ET reported earlier that he was in talks to join mid-tier tech services firm Mphasis as the CFO. The discussions were on that he would replace Mphasis’ CFO V Suryanarayan, who is due to retire in January.The news of Sanghrajka’s resignation in October took investors and analysts by surprise as it coincided with an anonymous whistleblower making allegations of accounting malfeasance against the company’s top executives.