49ers coach Mike Singletary is downplaying the team's assumed interest in Chargers linebacker Shawn Merriman. Singletary says he likes the team's four-man rotation of outside linebackers. "I think they're doing a good job," Singletary said. "I think they're applying pressure, they're winning some of the one-on-one battles. I think they're doing a good job overall." The Chargers placed Merriman on the injured reserve list with a calf injury last week. When healthy, they will release him.