The Bengals placed DT Pat Sims on injured reserve with a left ankle injury and signed DT Nick Hayden, the team announced Wednesday.
Sims missed Sunday's loss against the Steelers but there was hope that he could return before the end of the season. However, additional tests revealed that the ankle injury was injured more severely than initially thought. On the season, Sims has 20 tackles and one sack, mostly in a reserve role.
Hayden, in his fourth season from Wisconsin, started 10 games for the Panthers last season, recording 31 tackles and one sack.