Ahcan, 24, has five goals and 14 assists for 19 points in 31 AHL games with Providence this season. The 5-foot-8, 178-pound defenseman has skated in five career NHL games with Boston.
Lewington, 27, has posted one goal and three assists for four points with a plus-six rating in 26 AHL games with Providence this season. The 6-foot-2, 200-pound defenseman has appeared in 12 career NHL games with Boston, Nashville and Washington, totaling one goal and two assists for three points.