Ertz sustained a knee injury during Sunday's game at the Rams, Josh Weinfuss of ESPN.com reports.
On third-and-4 late in the first quarter, quarterback Colt McCoy connected with Ertz for a 12-yard completion. However, Ertz was in noticeable pain right away and walked slowly to the sideline tent before getting carted to the locker room. If he doesn't return, he'll end Week 10 action with just the one catch. Rookie second-round pick Trey McBride and Stephen Anderson are the next tight ends up for the Cardinals.