If Callahan recovers within the expected time frame, he would miss training camp, preseason, and the first month of the regular season.
The 33-year-old is no longer the offensive threat he once was, as injuries, age, and poor footspeed have caught up with him. He was relegated to fourth-line duties for most of the 2017-18 campaign, tallying five goals and 13 assists in 67 games.
Callahan still has two years remaining on his contract with an annual cap hit of $5.8 million.
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