Kolosov signed a three-year, entry-level contract with the Flyers on Saturday, per CapFriendly.
Kolosov was selected in the third round of the 2021 NHL Entry Draft. He's spent the bulk of the last two seasons with Dinamo Minsk of the KHL -- he posted a 2.54 GAA and a .912 save percentage in 42 regular-season games for the team last season. Per his agent, Kolosov will remain with Dinamo in 2023-24.