Hossa played after missing Game 3 on Monday night with an undisclosed upper body injury. Hossa was a late scratch from the lineup for that game. The Bruins won 2-0 and took a 2-1 lead in the best-of-seven series.
Blackhawks coach Joel Quenneville said after the team's Wednesday morning practice, "He's fine."
Hossa is tied for the Blackhawks' scoring lead in the playoffs with 15 points on seven goals and eight assists. Three of those goals have been game-winners.
During the regular season, the right wing was third on the team with 17 goals.