49ers sign veteran cornerback; Wishnowsky, Luter out indefinitely

SANTA CLARA — On a day in which the big news was which 49ers player was cleared, two other players reported to training camp with injuries that will sideline them indefinitely. Rookie cornerback Darrell Luter was placed on the physically-unable-to-perform due to a knee injury he sustained during the offseason program. Luter, a fifth-round draft pick from South Alabama, is expected to sit out "a few weeks," 49ers general manager John Lynch said. And punter Mitch Wishnowsky recently "tweaked" his back while lifting weights away from the 49ers' practice facility. He was placed on the non-football injury list. "It's nothing we're concerned about long term," Lynch said. "But with a back, you want those things to quiet down. If you don't, they can become chronic. So we want to put that to rest and we don't think it's too serious." Luter and Wishnowsky can be activated off their respective injury lists at any point during training camp. In a corresponding move, the 49ers later signed veteran cornerback Terrance Mitchell to a one-year deal. The eight-year pro will join his seventh team after playing for the Chicago Bears, Dallas Cowboys, Kansas City Chiefs, Cleveland Browns, Houston...