Rosen was recalled from AHL Springfield on Monday.
Rosen was sent to the minors ahead of the regular season, and he's recorded three goals, three assists and four PIM across 12 appearances with Springfield to begin the year. He hasn't made a regular-season appearance in the NHL since the 2023-24 campaign but will join the Blues to provide additional depth after Adam Jiricek and Theo Lindstein were sent down Monday.