Zboril was reassigned to AHL Providence on Saturday, per CapFriendly.
Milan Lucic (ankle) was placed on long-term injured reserve, and Zboril's contract made him an option to optimize the Bruins' cap relief from that move. The 26-year-old defenseman has 76 games of NHL experience, which could make him a candidate to be called up later in the year for depth on the blue line.