The San Francisco 49ers have signed veteran linebacker Kyzir White just five days before their playoff game against the Philadelphia Eagles. White, 29, has a notable career with 73 starts and 137 tackles last season for the Arizona Cardinals, though he struggles in coverage. Previously on the Titans practice squad, White was released after limited play, effectively signing off the couch. The move is driven by severe injury setbacks, including Tatum Bethune's season-ending torn groin, Fred Warner's fractured ankle, Dee Winters' ankle injury, and Nick Martin's concussion. Without their usual starters, the 49ers may rely on White and veteran Eric Kendricks to bolster their depleted linebacker corps. The team faces a tough challenge against the Eagles' potent offense, especially with star running back Saquon Barkley and an elite offensive line. The defense's ability to keep the score low will be crucial, as the offense must perform at its best to have a chance in this critical playoff matchup.