Lazar was selected by Ottawa with the 17th overall pick in the 2013 NHL Entry Draft and is a pending restricted free agent on July 1st. The 22-year-old forward had one assist in 33 games played with the Senators this season.
In 176 regular season games in Ottawa, Lazar compiled 12-24-36 totals prior to being traded to Calgary.
Kostka is a 31-year-old defenseman who appeared in 15 games with the Senators last season and has yet to play in a NHL game this season. In 46 games with the AHL’s Binghamton Senators this season, Kostka notched 1-11-12 totals.
The veteran defenseman has four goals and 17 assists in 85 career NHL games with the Toronto Maple Leafs, Chicago Blackhawks, Tampa Bay Lightning, New York Rangers and Senators. Kostka is a pending unrestricted free agent in July.
Jokipakka has one goal and five assists in 38 games this season with the Flames. The 25-year-old defenseman has 3-25-28 totals and 34 penalty minutes in 147 career NHL games with the Dallas Stars and Flames. Dallas originally selected him 195th overall at the 2011 NHL Entry Draft.
The native of Tampere, Finland appeared in two of three games for Finland at the 2016 World Cup of Hockey and is a pending restricted free agent this July.