The Calgary Flames have acquired defenceman Olli Määttä, prospect centre Jonathan Castagna, and three second-round selections in the 2026 NHL Draft (belonging to the New York Rangers, Ottawa Senators, and Utah Mammoth) from Utah. In return, Calgary has traded defenceman MacKenzie Weegar to the Mammoth.
Määttä, a veteran blueliner from Jyväskylä, Finland, brings more than a decade of NHL experience to the Flames’ defensive group. The 31-year-old left-shot defenceman is 6-foot-2 and 207 pounds, and has appeared in 22 games with Utah this season. He is known for his steady defensive play, positioning, and veteran leadership on the back end.
Also joining the organization is centre Jonathan Castagna, a developing prospect currently playing at Cornell University. Castagna is in his third NCAA season and has been a key offensive contributor for Cornell, leading the team in scoring with 14 goals and 18 assists for 32 points through 29 games.
The Flames also receive significant draft capital in the deal, adding three second-round picks in the 2026 NHL Draft.