Kopacka will join Swedish club Kristianstads IK after signing a contract Monday, AHL Insider Tony Androcktis reports.
Kopacka won't be qualified by the Senators, which means he'll become an unrestricted free agent Monday, Bruce Garrioch of the Ottawa Sun reports.
Kopacka was assigned to AHL Belleville on Sunday.
Kopacka was promoted to Ottawa's active roster Tuesday.
Kopacka was assigned to AHL Belleville on Saturday.
Kopacka was recalled from AHL Belleville to the taxi squad Saturday.
Kopacka was reassigned to AHL Belleville on Thursday.
Kopacka was added to Ottawa's taxi squad Wednesday.
Kopacka was acquired by the Senators, along with a 2022 seventh-round pick, from the Sharks for Christian Jaros after previously having been sent from Anaheim to San Jose in exchange for Trevor Carrick on Wednesday.
Kopacka signed a three-year, entry-level contract with the Ducks on Sunday.