Haggerty, 22, totaled 15 goals and 18 assists for 33 points in his first professional season with the Hartford Wolf Pack of the American Hockey League in 2014-15. His seven power-play goals ranked third on the team. Haggerty then recorded six points (two goals, four assists) in 14 Calder Cup Playoff games.
The Stamford, Conn., native previously registered 84 points (47 goals, 37 assists) over three seasons at Rensselaer Polytechnic Institute (RPI). Haggerty also participated in the United States National Team Development Program from 2009-11.
Raanta, 26, posted a 7-4-1 record, including one shutout, a .936 save percentage and 1.89 goals-against average in 14 games for the Blackhawks last season. The Rauma, Finland, native also notched an 8-1-1 record, including two shutouts, a .918 save percentage and 2.39 GAA in 11 games with Rockford last season.
Raanta owns a 20-8-5 record in 29 career NHL regular-season games, all with the Blackhawks. He signed his first NHL contract as a free agent with Chicago on June 3, 2013.