Wotherspoon, 25, set career highs with seven goals, 30 assists and 37 points in 67 AHL games for the Stockton Heat last season, his fifth pro campaign.
A second-round choice (57th overall) by Calgary in the 2011 NHL Draft, Wotherspoon spent five seasons in the Flames organization, collecting 18 goals and 80 assists for 98 points with a plus-62 rating in 285 AHL games with Stockton, Adirondack and Abbotsford.
The native of Burnaby, B.C., also has five assists in 30 career regular-season NHL games with the Flames, and he skated in six Stanley Cup Playoff contests for Calgary in 2015.
LaLeggia, 26, recorded 15 goals and 28 assists for a career-best 43 points in 68 games for the AHL’s Bakersfield Condors last season.
A fifth-round draft pick by Edmonton in 2012, LaLeggia turned pro after four seasons at the University of Denver and has registered 44 goals and 66 assists for 110 points in 203 AHL games with Bakersfield and Oklahoma City. He began his career as a defenseman before shifting to left wing in 2016-17.