"Marian's injury did not respond sufficiently to our non-operative treatment over the last three weeks so we have collectively decided today to go ahead with the surgery," Blackhawks general manager Stan Bowman said in a statement. "Marian is a franchise player, and we want what is best for him and the Blackhawks long-term. This was a mutual decision and one we feel very confident is the right one."
The Hawks signed Hossa to a 12-year, $62.8 million deal on July 1. The Hawks said they were aware of the injury before signing him.
"After consulting with my family and the Blackhawks, I have no doubt that this is the correct decision," Hossa said in a statement. "I plan on being a member of the Blackhawks for a very long time, which is why I want to get this done and begin my career in Chicago at 100 percent."
Hossa is expected to be shelved at least four months, so he'll miss at least the first two months of the regular season.
"Marian has a small right rotator cuff tear that he has been battling for a while, and because he is not at 100 percent with non-operative treatment, he is undergoing operative treatment tomorrow," Blackhawks physician Michael Terry said in a statement. "With this type of tear, we anticipate a four month post-operative recovery period, after which we expect his shoulder to be 100 percent. This is the best thing for Marian and his career long-term."
Hossa led the Red Wings with 40 goals last season and finished third in points with 71.