Andersson was assigned to AHL San Diego after completing his loan with Sodertalje SK in Sweden's second division, per CapFriendly.
The Bruins sent Andersson, David Backes and a first-round pick to the Ducks for Ondrej Kase on Friday.
Andersson has 16 points and a plus-11 rating with QMJHL Moncton this season.
Andersson signed a three-year, entry-level contract with the Bruins on Sunday, Steve Conroy of the Boston Herald reports.
Andersson was drafted 57th overall by the Bruins at the 2018 NHL Entry Draft on Saturday.