Dotson (ankle) was placed on injured reserve Saturday, Teresa Varley of the Steelers' official site reports.
Dotson sustained a high-ankle sprain in Sunday's Week 10 tie against the Lions and will be forced to miss at least three games as a result of his move to IR. J.C. Hassenauer is expected to replace Dotson as the Steelers' starting left guard beginning with Sunday's game against the Chargers.