Left guard Willie Colon was scratched just before the game, forcing Doug Legursky into the lineup. The depth was stretched even further when Mike Adams went down with an ankle injury.
That left them with Kelvin Beachum at right tackle and without many options in reserve with original right tackle Marcus Gilbert already out with his own ankle injury. We don’t yet know the status of either Colon or Adams, but the Steelers have shuffled their roster to leave themselves prepared to deal with his absence. Gilbert has been placed on injured reserve and the team has activated first-round pick David DeCastro from injured reserve.
Source:
Pro Football Talk