Smith-Schuster (knee) has been ruled out for Sunday's contest at Arizona, Teresa Varley of the Steelers' official site reports.
During a Week 11 clash with the Browns, Smith-Schuster was knocked from the contest with a concussion and was seen afterward with a heavy wrap on his left knee. While the first issue is behind him, he hasn't been able to get back on the practice field due to the knee concern. Smith-Schuster thus will miss a third game in a row, giving James Washington and Diontae Johnson another shot to lead Pittsburgh's receiving corps.