Boston Bruins defensemen Charlie McAvoy and Matt Grzelcyk will be out multiple months after undergoing shoulder surgeries Friday, the team announced.

McAvoy underwent a left shoulder arthroscopic stabilization procedure in Boston and is expected to miss about six months, the team said. The former first-round pick posted 10 goals and 56 points this season.

Grzelcyk underwent a right shoulder open-stabilization procedure, also in Boston, and he's expected to be out five months, per the team.