Keyser has bounced between the AHL and ECHL since turning pro in 2020. During the 2023 season, he played 24 games with Providence (AHL), going 13-6-2 with a 2.79 GAA and .900 SV%. As things currently stand, Keyser is No.4 on the Bruins goaltending depth chart.

Keyser will come up to serve as Linus Ullmark's backup on Thursday because Jeremy Swayman was moved into COVID-19 protocol.