Used primarily as a checking-line forward, Kruger had five goals and 12 assists for 17 points in 70 games last season.
The Blackhawks thanked Kruger, a two-time Stanley Cup winner, on Twitter and wished him luck with the Golden Knights.
Thank you and best of luck in Vegas, Krugs! pic.twitter.com/X1XGfgBTLp— Chicago Blackhawks (@NHLBlackhawks) July 2, 2017
The Associated Press contributed to this report.