He ranked fifth on the team overall for points and led all Vancouver blue-liners. Garrison averaged 20:53 in ice time per game in 2013-14, which ranked fourth among Canuck defensemen.
A native of White Rock, British Columbia, Garrison has played in 318 career NHL games with Vancouver and the Florida Panthers. During his career he has amassed 38 goals and 108 points.
Costello, who recently finished his senior season at Notre Dame, recorded 13 goals and 22 points in 40 games for the Fighting Irish last season.
The Milwaukee, Wisconsin, native was drafted by the Ottawa Senators in the fifth-round, 146th overall, at the 2009 NHL Entry Draft.