Lack has been assigned to the AHL’s Binghamton Devils; Prout will report to the AHL’s Stockton Heat.
Lack, 29, is 2-2-1 in five AHL appearances with Stockton this season, posting a 2.57 goals-against average and a .916 save percentage. He was also 1-2-0 (5.29, .813) in four appearances for Calgary in 2017-18.
In 119 career AHL appearances with Stockton, Charlotte, Chicago and Manitoba, Lack has a record of 59-48-8 with a 2.36 GAA, a .923 save percentage and 10 shutouts. He was a member of the AHL All-Rookie Team in 2010-11.
Lack is also 55-53-18 in 140 NHL games with Vancouver, Carolina and Calgary.
Prout, 27, skated in four NHL games with New Jersey this season before being assigned to Binghamton on Friday. In 124 career AHL games with Cleveland and Springfield, Prout has totaled five goals and 22 assists for 27 points.
A sixth-round draft pick by Columbus in 2010, Prout has appeared in 242 career NHL games with the Blue Jackets and Devils, recording six goals and 30 assists for 36 points.