Ahcan, 24, has two goals and eight assists for 10 points in 17 AHL games with Providence this season. The 5-foot-8, 178-pound defenseman has skated in three career NHL games with Boston.
Steen, 23, has produced six goals and seven assists for 13 points in 12 AHL games with Providence this season. The 5-foot-9, 192-pound forward has appeared in five career NHL games with Boston.