The 30-year-old defenseman is expected to need 4-6 months to recover. He signed a one-year, $850,000 contract with Detroit on July 14.
Pysyk had 12 points (three goals, nine assists) in 68 games for the Buffalo Sabres last season. Selected by Buffalo in the first round (No. 23) of the 2010 NHL Draft, he has 104 points (28 goals, 76 assists) in 521 regular-season games for the Sabres, Florida Panthers and Dallas Stars.
The Red Wings signed unrestricted free agent defenseman
Robert Hagg
to a one-year, $800,000 contract on Monday. He had nine points (one goal, eight assists) in 64 games for the Panthers and Sabres last season, including one assist in 16 games after he was acquired in a trade with the Sabres on March 20.