The club said Sunday that Farrell, who recently completed his final course of chemotherapy for non-Hodgkin lymphoma, will be back next season. The 53-year-old left the Red Sox on Aug. 14 after being diagnosed with stage 1 lymphoma, detected when he had surgery to repair a hernia. “It’s the right thing to do from an organizational perspective,” Red Sox president of baseball operations Dave Dombrowski said. The club also gave Torey Lovullo, Boston’s bench coach who served as interim manager while Farrell was out, a two-year contract extension through 2017. Lovullo waived his right to pursue managerial openings, and with him under contract, Boston has protection in case Farrell can’t come back. There was never any doubt in my mind or the rest of the coaching staff’s mind. Murphy had been guiding the Padres’ Triple-A team in El Paso when he was promoted. San Diego has not finished with a winning record since 2010 and has not reached the postseason since 2006. Amid speculation the manager is likely to be fired following a frustrating year for the Nationals, Rizzo spoke with reporters before Sunday’s season finale at Citi Field. Washington was a World Series favorite in spring training, but the Nationals struggled with injuries, poor play and internal turmoil.