Kapanen scored in the first period during Sunday's 4-1 win over the Kraken.
Kapanen earned an assist in Sunday's 7-2 win over the Canadiens.
Kapanen (lower body) is prepared to rejoin the lineup versus Buffalo on Saturday, Lou Korac of NHL.com reports.
Kapanen (lower body) may be available to return following the All-Star break, per Lou Korac of NHL.com.
Kapanen (lower body) will be re-evaluated in four weeks, the Blues announced Wednesday.
Kapanen posted two assists, two shots on net and three hits in Saturday's 4-2 win over the Penguins.
Kapanen (upper body) is expected to play in Monday's preseason matchup versus Columbus, according to Matthew DeFranks of the St. Louis Post-Dispatch.
Kapanen (upper body) won't play in Tuesday's preseason game versus the Blue Jackets.
Kapanen was charged with driving while intoxicated in Finland last month, according to Lance Hornby of the Toronto Sun.
Kapanen scored the game-winning goal and added an assist in Sunday's 3-0 win over the Jets.