Santini will be available to make his Blues debut in Monday's game against the Colorado Avalanche.
Santini, 26, signed with the Blues as a free agent on Oct. 10, 2020. Originally drafted by the New Jersey Devils in the second round (No. 42 overall) of the 2013 NHL Draft, the Bronxville, New York, native has collected 21 points (five goals, 16 assists) in 116 career NHL regular-season games with the New Jersey Devils and Nashville Predators.