Koivunen agreed to terms on an eight-year, $32 million contract with Pittsburgh on Thursday.
Novak agreed to terms on a three-year, $13.95 million contract extension with Pittsburgh on Friday.
McMichael signed a six-year, $40.5 million contract with the Blues on Thursday.
Gastrin was loaned to Brynas IF of the SHL on Monday.
Lapierre signed a two-year, $2.6 million contract with the Penguins on Friday.
Alexeyev signed a two-year contract with KHL club Salavat Yulaev on Thursday, Seth Rorabaugh of Tribune-Review Sports reports.
Van Riemsdyk signed a two-year, $8 million contract with the Penguins on Wednesday.
Dube signed a one-year, $850,000 contract with the Blues on Wednesday.
Kuzmenko signed a one-year, $5 million contract with Pittsburgh on Wednesday, Pierre LeBrun of TSN reports.
Johnston signed a three-year, $6 million contract with the Blues on Wednesday, per Lou Korac of NHL.com.
