Valtteri Puustinen a signé un contrat de 2 ans d'une valeur de 1 850 000 $ avec les Penguins de Pittsburgh, le 6 mai 2021. Le contrat comporte un cap hit de 842 500 $.
Second among U22 players in the Liiga in goals and points this year. Second among U21 players last year in goals and points. He has a pretty decent shot of making it.