Liles is out indefinitely after sustaining a concussion in Sunday's game against the Lightning.

Liles' concussion occurred when he crashed into the end boards during Sunday's tilt. The blueliner did not travel with the team for Tuesday's game, presumably to receive treatment. It's unclear at this point how long the 36-year-old will be sidelined. With Zdeno Chara ailing as well, the Bruins will likely look to Kevan Miller and Brandon Carlo to assume more playing time on the defensive end.

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