Panthers place QB Sam Darnold (shoulder) on injured reserve

The Carolina Panthers placed Sam Darnold on injured reserve Friday, one day after they signed fellow quarterback Cam Newton to a contract.Coach Matt Rhule said Darnold will be out at least four weeks with an injured throwing shoulder. Darnold was diagnosed earlier this week with an incomplete scapula fracture.P.J. Walker is expected to start the Panthers’ game against the Arizona Cardinals (8-1) on Sunday in Glendale, Ariz.Walker, 26, won his only previous NFL start last season, completing 24 of 34 passes for 258 yards, one touchdown and two interceptions in Carolina’s 20-0 defeat of the Detroit Lions on Nov. 22, 2020.After a 3-0 start, the Panthers have lost five of their past six, including a 24-6 defeat to the New England Patriots on Sunday. Darnold went 16-for-33 passing in that game with 172 yards, three interceptions and zero touchdowns.