Sam Darnold out vs. Cardinals in sudden Seahawks injury worry

The Seattle Seahawks have ruled quarterback Sam Darnold out of Sunday’s game against the Arizona Cardinals after he sustained a quad injury late in Monday’s loss to Chicago. The decision leaves Seattle needing to manage uncertainty at quarterback as it tries to improve on a 4-4 record.

Coach Mike Macdonald said Darnold also cracked a rib on the opening offensive series against the Bears, but the quad injury is the reason he will miss Week 9. Darnold is week-to-week and will not go on injured reserve; he could return against the Raiders in Week 10, before Seattle’s Week 11 bye. Drew Lock is set to start despite a right elbow injury that has limited his throwing, with Jalen Milroe backing him up and taking practice reps. Lock threw for 235 yards and three touchdowns in a 31-7 win over Arizona in Week 2; Seattle is tied with the Rams for second in the NFC West.