Urho Vaakanainen

In addition to making a two-game cameo with the Bruins, the No. 18 overall pick from the 2017 NHL Entry Draft registered four goals and 14 points in 30 games for AHL Providence last season. The 20-year-old's calling cards are his smooth skating and good stick, but it remains to be seen what sort of offensive ceiling he has at the NHL level. Given the team's current blue-line depth, Vaakanainen is probably destined to see some more AHL time in 2019-20, but the young Finn has established himself as the team's top blue-line prospect and it's only a matter of time before he becomes a fixture in Boston.

The 18th overall pick from the 2017 NHL Entry Draft registered four goals and 11 points in 43 games last season while playing for SaiPa in the Finnish Liiga. The 19-year-old is a smooth skater with a good stick, but it remains to be seen what sort of offensive ceiling he has. He'll have a shot to make the big club in his first campaign in North America, but given the team's blue-line depth, Vaakanainen will probably open the 2018-19 season in the AHL.