Letang, who also missed five games earlier this season with a groin injury, did not play in Wednesday night's outing against the Chicago Blackhawks.
This season, Letang has nine goals and 23 assists in 40 games for Pittsburgh, which heads into the All-Star break with a 26-12-8 record and 60 points, three behind the New York Islanders in the Metropolitan Division.
Letang is part of one of the league's best penalty-killing units. Pittsburgh kills off 87.1 percent of its opponents' power-play opportunities.
- Scooby Axson