The Chargers received permission Tuesday to interview four candidates to replace fired head coach Marty Schottenheimer, including one-time San Diego offensive coordinator Norv Turner. Turner was offensive coordinator with the Chargers in 2001. He's currently the offensive coordinator of the 49ers. He interviewed for the Cowboys' head coaching job that went to Wade Phillips, the Chargers' former defensive coordinator. The Chargers also received permission to interview 49ers assistant head coach Mike Singletary and Bears defensive coordinator Ron Rivera, both of whom interviewed for the Cowboys job. The fourth candidate is Ravens defensive coordinator Rex Ryan. The Chargers did not say when the candidates would be interviewed.