Vancouver released Blais on Monday from his professional tryout agreement.
Blais inked a professional tryout agreement with Vancouver on Thursday.
Blais posted four hits and a shot on net across 7:27 of ice time in Wednesday's 2-1 win over the Stars.
Blais notched an assist and six hits in Saturday's 5-1 loss to the Kings.
Blais scored a goal, recorded two shots on goal, dished out two hits and finished plus-2 in Thursday's 6-2 loss to the Coyotes.
Blais logged a pair of assists in Sunday's 7-6 loss to Los Angeles.
Blais signed a one-year, $1 million contract extension with St. Louis on Thursday.
Blais was shipped back to the Blues from the Rangers on Thursday in exchange for Vladimir Tarasenko and Niko Mikkola. In addition to Blais, the Blues also acquired Hunter Skinner, a conditional 2023 first-round pick and a conditional 2024 fourth-round pick.
Blais was recalled from his conditioning stint with AHL Hartford on Saturday, according to AHL reporter Ricky Milliner.
Blais (not injury related) was assigned to AHL Hartford for conditioning on Tuesday.