Melton (knee) did not participate at practice Thursday, Darren Urban of the Cardinals' official site reports.
Melton popped up on the Cardinals' injury report with a knee issue Wednesday, but he was at least able to practice in a limited capacity at that point. Now, he's trending in the wrong direction ahead of Sunday's game versus the Broncos, and he'll probably have to practice again Friday to put himself back on track to suit up in Week 7.