McAvoy, 22, suffered a lower body injury in the team's win vs. Washington on December 23. The 6-foot, 208-pound defenseman has produced 13 assists with a plus-13 rating in 38 games with Boston this season.
Lauzon, 22, skated in 16 games with Boston last season. He has tallied one goal and nine assists for 10 points with a plus-16 rating in 35 games with Providence this year. The 6-foot-1, 205-pound defenseman was originally selected by Boston in the second round (52nd overall) of the 2015 NHL Draft.